Freezing Dates
The IEM processed "climodat" archive is used to list out the first dates after 1 August that a given site first dipped below 32°F and 28°F. The dates when those events occurred are shown. The second set of columns print out the fall day of the year that the climatology dips below the given threshold.
Only the August through March period is considered for this analysis. There is currently a data processing bug whereby the year of the first dates are not shown for all sites. This will be fixed over the coming days.
| ID | Climodat Site: | Min Low: | First Date with Observed Below: | First Date with Average Below: | |||||
|---|---|---|---|---|---|---|---|---|---|
| Temp <= 32°F | Temp <= 28°F | Below 40°F | Below 32°F | Below 28°F | Temp: | Date: | Temp: | Date: | |
| IA0000 | Iowa Average | -31 | 32 | {1902}-09-13 | 24 | {1942}-09-28 | 10-19 | 11-08 | 11-13 |
| IA0064 | AFTON | -30 | 32 | {1902}-09-12 | 27 | {1913}-09-22 | 10-22 | 11-08 | 11-21 |
| IA0070 | ADEL 1 SE | -24 | 31 | {1962}-09-20 | 27 | {1967}-09-29 | 10-01 | 11-05 | 11-18 |
| IA0088 | AKRON | -39 | 28 | {1902}-09-12 | 28 | {1902}-09-12 | 10-17 | 11-02 | 11-10 |
| IA0089 | AKRON 11E | -15 | 32 | {2011}-09-15 | 27 | {2012}-10-05 | 09-23 | 10-20 | 10-31 |
| IA0112 | ALBIA | -31 | 31 | {1916}-09-18 | 27 | {1913}-09-22 | 10-25 | 11-10 | 11-22 |
| IA0116 | ALBIA PASTURE IMP FARM | -24 | 32 | {1962}-09-20 | 25 | {1964}-10-09 | 10-24 | 11-10 | 11-19 |
| IA0131 | ALGONA 1NNW | -26 | 31 | {2007,2011}-09-15 | 28 | {2003}-10-01 | 10-15 | 11-07 | 11-11 |
| IA0133 | ALGONA | -36 | 29 | {1893}-09-02 | 27 | {1929}-09-18 | 10-17 | 11-02 | 11-11 |
| IA0149 | Allerton | -33 | 31 | {1991}-09-19 | 27 | {1913}-09-22 | 10-24 | 11-10 | 11-22 |
| IA0157 | ALLISON | -31 | 32 | {1915}-08-30 | 28 | {1926}-09-25 | 10-18 | 11-05 | 11-11 |
| IA0173 | ALTA | -36 | 29 | {1902}-09-12 | 26 | {1913}-09-22 | 10-19 | 11-02 | 11-10 |
| IA0175 | ALTA NEAR | -36 | 31 | {1902}-09-12 | 27 | {1918}-09-20 | 10-12 | 10-28 | 11-11 |
| IA0181 | ALTON | -42 | 31 | {1916}-09-15 | 27 | {1918}-09-20 | 10-17 | 11-02 | 11-10 |
| IA0187 | ALTOONA 4W | -21 | 31 | {2012}-09-23 | 27 | {2003}-10-02 | 10-24 | 11-11 | 11-20 |
| IA0193 | AMANA | -32 | 30 | {1896}-09-20 | 28 | {1913}-09-22 | 10-12 | 11-03 | 11-12 |
| IA0197 | AMES MUNICIPAL AP | -31 | 31 | {2007}-09-15 | 27 | {2003}-09-30 | 10-14 | 11-02 | 11-11 |
| IA0199 | AMES 3 N | -22 | 30 | {2012}-09-23 | 27 | {2012}-10-06 | 10-16 | 11-10 | 11-11 |
| IA0200 | AMES-8-WSW | -37 | 31 | {1902}-09-13 | 26 | {1918}-09-21 | 10-19 | 11-08 | 11-21 |
| IA0203 | AMES 5 SE | -33 | 32 | {1902}-09-13 | 28 | {1926}-09-26 | 10-23 | 11-08 | 11-21 |
| IA0205 | AMES 3 SW | -37 | 31 | {1902}-09-13 | 26 | {1918}-09-21 | 10-20 | 11-03 | 11-17 |
| IA0209 | AMES EXPERIMENT STATION | -25 | 29 | {1896}-09-19 | 28 | {1896}-10-06 | 09-27 | 10-24 | 10-29 |
| IA0210 | AMES SOUTHEAST | -26 | 25 | {1899}-09-29 | 25 | {1899}-09-29 | 10-06 | 10-29 | 11-02 |
| IA0213 | ANAMOSA-1-WNW | -37 | 29 | {1998}-09-08 | 27 | {1956}-09-20 | 10-10 | 11-05 | 11-21 |
| IA0214 | ANAMOSA 3 SSW | -27 | 30 | {2012}-09-24 | 26 | {2024}-10-16 | 10-17 | 11-02 | 11-12 |
| IA0220 | ANAMOSA NO 2 | -26 | 31 | {2012}-09-23 | 23 | {2003}-10-02 | 10-16 | 11-11 | 11-21 |
| IA0238 | ANKENY 2 SE | -21 | 31 | {2012}-09-23 | 27 | {2003}-10-02 | 10-24 | 11-11 | 11-20 |
| IA0241 | Ankeny | -34 | 32 | {1999}-09-18 | 22 | {1999}-09-21 | 10-18 | 11-06 | 11-12 |
| IA0262 | ANTHON | -23 | 30 | {1943}-09-20 | 28 | {1942}-09-24 | 10-09 | 10-22 | 10-26 |
| IA0364 | ATLANTIC-1-NE | -37 | 30 | {1893}-09-02 | 28 | {1902,1955}-09-12 | 10-17 | 11-02 | 11-11 |
| IA0366 | ATLANTIC NEAR | -16 | 31 | {1896}-09-28 | 26 | {1896}-10-18 | 10-06 | 10-16 | 10-18 |
| IA0385 | AUDUBON | -35 | 30 | {1955,1902}-09-12 | 27 | {1896}-09-19 | 10-17 | 11-02 | 11-11 |
| IA0463 | BANCROFT | -35 | 32 | {1902}-09-13 | 28 | {1929}-09-18 | 10-13 | 11-02 | 11-11 |
| IA0493 | BARTLETT 5 E | -23 | 30 | {1951}-09-28 | 28 | {1952}-10-06 | 10-26 | 11-09 | 11-22 |
| IA0506 | BATAVIA | -7 | 28 | {1899}-09-29 | 28 | {1899}-09-29 | 09-29 | 11-08 | 11-25 |
| IA0512 | BATTLE CREEK 3NE | -35 | 32 | {2014}-09-13 | 24 | {2012}-09-23 | 10-07 | 10-27 | 10-31 |
| IA0513 | BAXTER | -33 | 32 | {1902}-09-12 | 28 | {1913}-09-22 | 10-19 | 11-02 | 11-14 |
| IA0519 | BAYARD 6 SE | -21 | 30 | {2012}-09-23 | 26 | {2003}-10-02 | 10-16 | 11-09 | 11-20 |
| IA0536 | BEACONSFIELD | -30 | 27 | {1991}-09-19 | 27 | {1991}-09-19 | 10-19 | 11-09 | 11-21 |
| IA0549 | BEAVER 2 NE | -18 | 32 | {1949}-09-29 | 26 | {1948}-10-17 | 10-22 | 11-10 | 11-20 |
| IA0576 | BEDFORD-1-NNW | -34 | 28 | {1902}-09-13 | 28 | {1902}-09-13 | 10-19 | 11-10 | 11-21 |
| IA0596 | BELKNAP | -23 | 27 | {1899}-09-29 | 27 | {1899}-09-29 | 10-20 | 11-06 | 11-19 |
| IA0600 | BELLE-PLAINE | -38 | 31 | {1917}-09-11 | 28 | {1929,1916}-09-18 | 10-17 | 11-08 | 11-12 |
| IA0602 | BELLE PLAINE 3 S | -23 | 31 | {2012}-09-23 | 24 | {2003}-10-02 | 10-25 | 11-11 | 11-20 |
| IA0608 | BELLEVUE-L-AND-D-12 | -35 | 32 | {1986}-08-30 | 28 | {1995,1974}-09-23 | 10-19 | 11-10 | 11-21 |
| IA0612 | BELMOND | -37 | 32 | {1923}-09-14 | 26 | {1929}-09-18 | 10-17 | 11-01 | 11-11 |
| IA0745 | BLOCKTON 1W | -28 | 31 | {1901}-09-18 | 28 | {1942}-09-28 | 10-27 | 11-13 | 11-23 |
| IA0753 | BLOOMFIELD | -29 | 31 | {1991}-09-20 | 26 | {1913}-09-23 | 10-25 | 11-11 | 11-22 |
| IA0793 | BONAPARTE 5 NE | -31 | 32 | {1916}-09-18 | 26 | {1899}-09-29 | 10-21 | 11-11 | 11-22 |
| IA0807 | Boone | -35 | 32 | {1975}-09-12 | 27 | {1929}-09-18 | 10-17 | 11-03 | 11-12 |
| IA0812 | BOONE 3 WNW | -26 | 31 | {1929}-09-18 | 23 | {1942}-09-28 | 10-17 | 11-03 | 11-21 |
| IA0910 | BRIGHTON | -25 | 32 | {1984}-09-26 | 25 | {2003}-10-02 | 10-27 | 11-11 | 11-21 |
| IA0923 | BRITT | -36 | 30 | {1983}-08-13 | 27 | {1902}-09-13 | 10-16 | 11-02 | 11-10 |
| IA0933 | BROOKLYN | -27 | 32 | {1991}-09-19 | 28 | {1991}-09-20 | 10-18 | 11-10 | 11-12 |
| IA0940 | BRUNSVILLE | -15 | 32 | {2010}-10-17 | 27 | {2010}-10-28 | 10-02 | 10-19 | 10-28 |
| IA0999 | BUCKEYE | -25 | 32 | {2007}-09-15 | 28 | {1984}-09-26 | 10-16 | 11-08 | 11-12 |
| IA1005 | BUCKINGHAM | -31 | 32 | {1902}-09-13 | 27 | {1908}-09-29 | 10-12 | 10-28 | 11-12 |
| IA1060 | BURLINGTON | -26 | 32 | {1984}-09-26 | 28 | {1974}-10-02 | 10-28 | 11-12 | 11-27 |
| IA1063 | Burlington Airport | -27 | 30 | {1918}-09-18 | 25 | {1942}-09-28 | 10-27 | 11-12 | 11-24 |
| IA1099 | BUSSEY 3 WNW | -29 | 32 | {1902}-09-13 | 24 | {1942}-09-28 | 10-25 | 11-11 | 11-22 |
| IA1126 | CALMAR NE | -32 | 32 | {2007,2011}-09-15 | 27 | {2012}-10-07 | 10-13 | 11-01 | 11-12 |
| IA1233 | CARROLL-2-SSW | -40 | 28 | {1974}-09-03 | 28 | {1974}-09-03 | 10-17 | 11-02 | 11-10 |
| IA1245 | CARSON 3NNE | -31 | 32 | {1902}-09-13 | 26 | {1942}-09-28 | 10-21 | 11-08 | 11-21 |
| IA1257 | CASCADE | -35 | 32 | {2023}-08-31 | 28 | {1953,1974}-09-22 | 10-10 | 11-05 | 11-11 |
| IA1277 | CASTANA-EXP-FARM | -27 | 30 | {1991}-09-19 | 28 | {1995}-09-22 | 10-19 | 11-04 | 11-19 |
| IA1300 | CEDAR FALLS | -32 | 32 | {1902}-09-13 | 27 | {1974}-09-22 | 10-18 | 11-05 | 11-12 |
| IA1314 | Cedar Rapids Airport | -30 | 31 | {2007}-09-15 | 28 | {2012}-09-24 | 10-18 | 11-07 | 11-20 |
| IA1319 | CEDAR-RAPIDS-1 | -33 | 32 | {2007}-09-15 | 24 | {1926}-09-26 | 10-24 | 11-10 | 11-21 |
| IA1324 | CEDAR RAPIDS 2 | -30 | 31 | {1929}-09-18 | 28 | {1926}-09-26 | 10-22 | 11-09 | 11-22 |
| IA1354 | CENTERVILLE | -30 | 31 | {1913}-09-13 | 28 | {1913}-09-22 | 10-25 | 11-11 | 11-22 |
| IA1358 | CENTERVILLE 5 E | -20 | 29 | {1974}-10-02 | 25 | {1976}-10-17 | 10-16 | 11-12 | 11-14 |
| IA1363 | CENTRAL CITY | -31 | 31 | {2012}-09-23 | 23 | {2003}-10-02 | 10-16 | 11-11 | 11-12 |
| IA1394 | CHARITON | -38 | 32 | {1955}-09-12 | 28 | {1918,1991}-09-20 | 10-18 | 11-08 | 11-21 |
| IA1398 | CHARITON 5SSE | -24 | 31 | {1995}-09-22 | 28 | {1974}-10-02 | 10-31 | 11-11 | 11-24 |
| IA1402 | CHARLES-CITY | -34 | 32 | {1955,1902}-09-12 | 28 | {1991}-09-20 | 10-16 | 11-03 | 11-11 |
| IA1407 | CHARLES CITY NO 2 | -26 | 31 | {2007}-09-15 | 21 | {2003}-10-02 | 10-15 | 11-09 | 11-20 |
| IA1442 | CHEROKEE | -35 | 31 | {1974}-09-03 | 27 | {1955}-09-11 | 10-09 | 11-01 | 11-07 |
| IA1443 | CHEROKEE # 2 | -17 | 32 | {2007}-09-15 | 28 | {2003}-10-01 | 10-15 | 11-02 | 11-20 |
| IA1461 | CHESTER | -19 | 30 | {1902}-09-12 | 26 | {1902}-09-13 | 09-07 | 09-12 | 09-13 |
| IA1472 | CHILLICOTHE | -8 | 26 | {1899}-09-29 | 26 | {1899}-09-29 | 09-26 | 09-29 | 09-29 |
| IA1528 | CLARENCE | -26 | 32 | {1956}-09-20 | 25 | {1942}-09-28 | 10-24 | 11-10 | 11-21 |
| IA1533 | CLARINDA | -31 | 31 | {1902}-09-13 | 28 | {1918}-09-21 | 10-19 | 11-08 | 11-20 |
| IA1535 | CLARINDA 1 E | -17 | 32 | {2003}-09-29 | 28 | {2004}-10-02 | 10-24 | 11-11 | 11-20 |
| IA1536 | CLARINDA PLUM CREEK | -22 | 29 | {1942}-09-24 | 27 | {1942}-09-28 | 10-23 | 11-03 | 11-11 |
| IA1537 | CLARINDA TARKIO CREEK | -22 | 30 | {1942}-09-24 | 27 | {1942}-09-28 | 10-23 | 11-03 | 11-11 |
| IA1538 | CLARINDA WALNUT CREEK | -23 | 29 | {1942}-09-24 | 27 | {1942}-09-28 | 10-23 | 11-03 | 11-11 |
| IA1541 | CLARION | -32 | 32 | {1950}-08-20 | 1 | {2018}-08-28 | 10-15 | 11-03 | 11-11 |
| IA1586 | CLEAR LAKE | -35 | 32 | {1908}-09-28 | 27 | {1899}-09-29 | 10-12 | 11-02 | 11-11 |
| IA1610 | CLERMONT | -27 | 32 | {2007}-09-15 | 22 | {2003}-10-02 | 10-15 | 11-11 | 11-20 |
| IA1635 | CLINTON-1 | -29 | 31 | {1902}-09-13 | 28 | {1928}-09-25 | 10-24 | 11-11 | 11-22 |
| IA1640 | CLINTON 2 | -28 | 32 | {1956}-09-20 | 28 | {1926}-09-26 | 10-24 | 11-12 | 11-22 |
| IA1651 | CLIO 4 NW | -26 | 30 | {1995}-09-22 | 28 | {1993}-10-10 | 10-10 | 10-31 | 11-04 |
| IA1704 | CLUTIER | -29 | 32 | {1991}-09-20 | 28 | {1984}-09-29 | 10-18 | 11-10 | 11-12 |
| IA1705 | COGGON | -40 | 30 | {2007}-09-15 | 26 | {2012}-09-24 | 10-15 | 11-03 | 11-11 |
| IA1708 | COLLEGE SPRINGS | -28 | 32 | {1901}-09-17 | 24 | {1901}-09-18 | 10-17 | 11-06 | 11-18 |
| IA1710 | COLO | -28 | 31 | {1991}-09-19 | 28 | {1974}-09-22 | 10-10 | 11-04 | 11-11 |
| IA1724 | COLUMBIA | -22 | 28 | {2003}-10-02 | 28 | {2003}-10-02 | 10-15 | 11-11 | 11-13 |
| IA1731 | COLUMBUS JUNCT 2 SSW | -34 | 31 | {1955}-09-12 | 28 | {1991}-09-20 | 10-25 | 11-11 | 11-22 |
| IA1737 | CONESVILLE 3 NE | -22 | 32 | {2003}-09-29 | 24 | {2003}-10-02 | 10-27 | 11-12 | 11-21 |
| IA1742 | CONRAD | -28 | 32 | {2007}-09-15 | 28 | {1984}-09-29 | 10-18 | 11-07 | 11-12 |
| IA1793 | COON RAPIDS | -34 | 32 | {1902}-09-12 | 27 | {1913}-09-22 | 10-24 | 11-08 | 11-21 |
| IA1823 | CORALVILLE | -23 | 32 | {2012}-09-23 | 24 | {2003}-10-02 | 10-25 | 11-12 | 11-21 |
| IA1828 | CORALVILLE DAM | -27 | 32 | {1991,1983}-09-20 | 19 | {1983}-09-22 | 10-18 | 11-11 | 11-21 |
| IA1833 | CORNING | -32 | 32 | {1902}-09-12 | 27 | {1983}-09-21 | 10-19 | 11-08 | 11-13 |
| IA1838 | CORRECTIONVILLE 1 SW | -25 | 31 | {1991}-09-19 | 28 | {1942}-09-24 | 10-19 | 11-07 | 11-20 |
| IA1848 | CORYDON 8 W | -31 | 32 | {1918}-09-21 | 25 | {1913}-09-22 | 10-23 | 11-10 | 11-22 |
| IA1888 | COUNCIL BLUFFS 6 NNE | -16 | 30 | {1951}-09-28 | 28 | {1948}-10-17 | 10-22 | 11-10 | 11-10 |
| IA1889 | COUNCIL BLUFFS 6 NE | -32 | 32 | {1955}-09-12 | 28 | {1953}-09-22 | 10-21 | 11-08 | 11-19 |
| IA1954 | CRESCO-1-NE | -36 | 31 | {1902}-09-12 | 28 | {1929}-09-18 | 10-12 | 11-02 | 11-10 |
| IA1962 | Creston | -31 | 31 | {1924}-09-15 | 28 | {1991}-09-19 | 10-20 | 11-08 | 11-20 |
| IA2007 | CUMBERLAND | -32 | 32 | {1902}-09-13 | 25 | {1942}-09-28 | 10-25 | 11-11 | 11-22 |
| IA2026 | CUSHING | -26 | 32 | {1934}-09-21 | 27 | {1942}-09-24 | 10-22 | 11-03 | 11-08 |
| IA2041 | Dakota City | -25 | 31 | {2011,2007}-09-15 | 24 | {2003}-10-02 | 10-13 | 11-01 | 11-11 |
| IA2055 | DALLAS 2 NW | -19 | 32 | {2012}-09-23 | 28 | {2003}-10-02 | 10-26 | 11-11 | 11-20 |
| IA2062 | DANVILLE | -17 | 29 | {1899}-09-29 | 24 | {1899}-09-30 | 10-17 | 11-03 | 11-25 |
| IA2068 | DAVENPORT | -25 | 30 | {1942}-09-28 | 28 | {1899}-09-30 | 10-27 | 11-12 | 11-22 |
| IA2069 | DAVENPORT LOCK & DAM 15 | -22 | 30 | {1974}-10-02 | 28 | {1979}-10-13 | 10-28 | 11-20 | 11-27 |
| IA2070 | DAVENPORT WFO | -27 | 30 | {2012}-09-23 | 27 | {2012}-10-05 | 10-16 | 11-01 | 11-12 |
| IA2071 | DAVENPORT 2 | -23 | 31 | {1923}-09-14 | 28 | {1926}-09-26 | 10-19 | 11-08 | 11-22 |
| IA2110 | DECORAH-2-N | -43 | 32 | {1915}-08-30 | 28 | {1946}-09-02 | 10-13 | 11-03 | 11-11 |
| IA2112 | DECORAH 2 S | -37 | 31 | {1950}-08-20 | 28 | {1946}-09-02 | 10-12 | 11-02 | 11-11 |
| IA2117 | DECORAH 2 | -27 | 32 | {2007}-09-15 | 27 | {2012}-10-07 | 10-16 | 11-11 | 11-20 |
| IA2136 | DELAWARE 3 WSW | -32 | 32 | {1902}-09-12 | 25 | {1962}-09-19 | 10-17 | 11-05 | 11-12 |
| IA2171 | DENISON | -40 | 29 | {1902}-09-12 | 21 | {1918}-09-21 | 10-18 | 11-06 | 11-11 |
| IA2173 | DENISON SCS | -21 | 32 | {1943}-09-20 | 28 | {1942}-09-24 | 09-24 | 10-26 | 10-26 |
| IA2195 | DERBY | -24 | 31 | {1995}-09-22 | 28 | {1974}-10-02 | 10-26 | 11-12 | 11-23 |
| IA2199 | DES MOINES (63RD STREET) | -21 | 32 | {2005}-10-07 | 28 | {2009}-10-10 | 10-18 | 11-10 | 11-16 |
| IA2201 | DES MOINES SNOW | -21 | 31 | {2012}-09-23 | 27 | {2012}-10-06 | 10-18 | 11-11 | 11-12 |
| IA2203 | Des Moines Airport | -29 | 31 | {1995}-09-22 | 26 | {1942}-09-28 | 10-24 | 11-11 | 11-21 |
| IA2208 | Des Moines SE 6th | -29 | 32 | {1913}-09-22 | 28 | {1942}-09-28 | 10-27 | 11-12 | 11-22 |
| IA2209 | DES MOINES WSFO-JOHNSTON | -27 | 31 | {1999}-09-21 | 28 | {2004}-10-02 | 10-24 | 11-10 | 11-21 |
| IA2210 | DES MOINES MILLMAN | -17 | 32 | {1896}-09-28 | 27 | {1896}-10-18 | 10-06 | 11-02 | 11-06 |
| IA2212 | DE SOTO | -32 | 32 | {1907}-09-25 | 26 | {1908,1899}-09-29 | 10-12 | 10-28 | 11-14 |
| IA2235 | DE WITT | -28 | 32 | {1956,1991}-09-20 | 24 | {2003}-10-02 | 10-19 | 11-12 | 11-21 |
| IA2236 | DE WITT 4 S | -28 | 32 | {2012}-09-24 | 24 | {2003}-10-02 | 10-16 | 11-12 | 11-22 |
| IA2240 | DEXTER | -22 | 29 | {1942}-09-24 | 24 | {1942}-09-28 | 10-22 | 11-03 | 11-21 |
| IA2299 | Donnellson | -28 | 31 | {1991}-09-20 | 25 | {1942}-09-28 | 10-25 | 11-11 | 11-22 |
| IA2311 | DORCHESTER | -32 | 32 | {2007}-09-15 | 26 | {1974}-09-22 | 10-18 | 11-05 | 11-20 |
| IA2315 | DORCHESTER HWY 76 | -27 | 32 | {2007}-09-15 | 22 | {2003}-10-02 | 10-16 | 11-09 | 11-20 |
| IA2355 | DOWS | -32 | 31 | {1902}-09-12 | 28 | {1897}-09-20 | 10-11 | 10-28 | 11-09 |
| IA2361 | DUBUQUE NO 2 | -28 | 31 | {2012}-09-23 | 23 | {2003}-10-02 | 10-16 | 11-11 | 11-20 |
| IA2362 | DUBUQUE #3 | -30 | 31 | {2012}-09-24 | 27 | {2015}-10-17 | 10-15 | 11-07 | 11-12 |
| IA2364 | DUBUQUE-LOCK-AND-DAM | -37 | 31 | {1956}-09-20 | 24 | {1899}-09-30 | 10-27 | 11-11 | 11-22 |
| IA2367 | Dubuque Airport | -31 | 32 | {2007}-09-15 | 28 | {1956}-09-20 | 10-18 | 11-06 | 11-20 |
| IA2369 | DUBUQUE RIVER | -26 | 30 | {1942}-09-25 | 24 | {1899}-09-30 | 10-25 | 11-11 | 11-22 |
| IA2388 | DUMONT | -29 | 31 | {2007}-09-15 | 26 | {1974}-09-22 | 10-17 | 11-03 | 11-14 |
| IA2396 | DUNBAR 2 NE | -23 | 30 | {1942}-09-24 | 22 | {1942}-09-28 | 10-23 | 11-04 | 11-21 |
| IA2410 | DURANGO 3W | -18 | 31 | {2003}-09-29 | 23 | {2003}-10-02 | 10-05 | 11-11 | 11-24 |
| IA2456 | EARLHAM | -36 | 31 | {1902}-09-12 | 21 | {1913}-09-22 | 10-19 | 11-02 | 11-12 |
| IA2541 | EDDYVILLE | -22 | 31 | {1942}-09-24 | 24 | {1942}-09-28 | 10-26 | 11-13 | 11-22 |
| IA2544 | EDDYVILLE NO 2 | -19 | 32 | {2012}-09-23 | 26 | {2003}-10-02 | 10-27 | 11-11 | 11-21 |
| IA2555 | ELBERON 3 S | -23 | 31 | {2012}-09-23 | 24 | {2003}-10-02 | 10-25 | 11-11 | 11-20 |
| IA2569 | ELDON | -24 | 31 | {1902}-09-13 | 25 | {1899}-09-29 | 10-14 | 11-03 | 11-15 |
| IA2573 | Eldora | -32 | 31 | {2005}-08-29 | 28 | {1974}-09-22 | 10-17 | 11-05 | 11-12 |
| IA2595 | ELKADER 1 SE | -27 | 32 | {2007}-09-15 | 22 | {2003}-10-02 | 10-16 | 11-09 | 11-20 |
| IA2603 | Elkader 6SSW (Osborn) | -47 | 32 | {1893}-08-29 | 0 | {2002}-09-02 | 10-10 | 11-02 | 11-11 |
| IA2630 | ELLIOTT | -35 | 29 | {1913}-09-22 | 25 | {1915}-10-09 | 10-11 | 10-28 | 11-12 |
| IA2638 | ELMA | -31 | 31 | {2007}-09-15 | 21 | {2003}-10-02 | 10-13 | 11-01 | 11-11 |
| IA2678 | EMERSON 4 ENE | -30 | 30 | {1901}-09-18 | 26 | {1942}-09-28 | 10-25 | 11-08 | 11-22 |
| IA2689 | Emmetsburg | -36 | 0 | {2005}-09-03 | 0 | {2005}-09-03 | 10-16 | 11-02 | 11-10 |
| IA2697 | EMMETSBURG 2 NW | -28 | 31 | {2007,2011}-09-15 | 27 | {2003}-10-01 | 10-14 | 11-07 | 11-11 |
| IA2724 | Estherville 4E | -38 | 32 | {1924}-09-09 | 27 | {1929}-09-18 | 10-09 | 10-29 | 11-08 |
| IA2725 | ESTHERVILLE MUNICIPAL AP | -32 | 31 | {2014}-09-13 | 28 | {2007}-09-15 | 10-10 | 10-27 | 11-10 |
| IA2726 | ESTHERVILLE 1WSW | -29 | 30 | {2007}-09-15 | 26 | {2003}-10-01 | 10-14 | 11-07 | 11-11 |
| IA2755 | EVERLY 3 WNW | -27 | 27 | {1973}-08-22 | 27 | {1973}-08-22 | 10-15 | 11-04 | 11-11 |
| IA2778 | FAIRBANK | -21 | 32 | {2007}-09-15 | 22 | {2003}-10-02 | 10-11 | 11-03 | 11-23 |
| IA2789 | FAIRFIELD | -31 | 32 | {1917}-09-11 | 28 | {1918}-09-21 | 10-25 | 11-11 | 11-22 |
| IA2805 | FAIRPORT | -24 | 32 | {1928}-09-25 | 26 | {1935}-10-04 | 10-21 | 11-06 | 11-22 |
| IA2864 | FAYETTE | -40 | 32 | {1949}-09-01 | 27 | {1902}-09-12 | 10-12 | 11-02 | 11-11 |
| IA2896 | FLORENCE | -29 | 29 | {1904}-10-06 | 28 | {1905}-10-12 | 10-11 | 10-23 | 10-27 |
| IA2960 | FONDA | -30 | 25 | {1900}-09-16 | 25 | {1900}-09-16 | 09-20 | 11-01 | 11-07 |
| IA2977 | FOREST-CITY | -36 | 31 | {1949}-09-01 | 27 | {1929}-09-18 | 10-13 | 11-02 | 11-10 |
| IA2999 | FORT-DODGE | -35 | 32 | {1974}-09-03 | 27 | {1902}-09-13 | 10-17 | 11-03 | 11-11 |
| IA3003 | FORT DODGE 4 NW | -23 | 32 | {2007,2011}-09-15 | 25 | {2003}-10-02 | 10-15 | 11-07 | 11-20 |
| IA3007 | Fort Madison | -28 | 32 | {1913}-09-22 | 26 | {1942}-09-28 | 10-28 | 11-21 | 11-27 |
| IA3019 | FREDERICKSBURG | -14 | 32 | {1898}-10-06 | 27 | {1897}-10-09 | 10-06 | 10-29 | 11-02 |
| IA3022 | FRUITLAND | -29 | 32 | {1913}-09-22 | 26 | {1935}-10-04 | 10-21 | 11-12 | 11-22 |
| IA3032 | FULTON | -30 | 31 | {2012}-09-23 | 23 | {2003}-10-02 | 10-16 | 11-09 | 11-13 |
| IA3107 | GALVA | -41 | 24 | {1902}-09-04 | 24 | {1902}-09-04 | 10-08 | 10-27 | 11-09 |
| IA3108 | GALVA | -41 | 24 | {1902}-09-04 | 24 | {1902}-09-04 | 10-19 | 11-04 | 11-12 |
| IA3113 | GARBER | -28 | 31 | {2012}-09-23 | 22 | {2003}-10-02 | 10-16 | 11-11 | 11-20 |
| IA3115 | GARDEN GROVE | -24 | 30 | {1896}-09-20 | 28 | {1896}-10-07 | 10-06 | 11-01 | 11-05 |
| IA3120 | GARWIN | -28 | 32 | {1991}-09-20 | 28 | {1984}-09-29 | 10-18 | 11-10 | 11-12 |
| IA3239 | GILMAN | -30 | 32 | {1902}-09-13 | 22 | {1942}-09-28 | 10-24 | 11-09 | 11-21 |
| IA3278 | GLADBROOK | -26 | 26 | {1899}-09-29 | 26 | {1899}-09-29 | 10-06 | 10-29 | 11-02 |
| IA3288 | GLENWOOD | -19 | 32 | {2012}-09-23 | 27 | {2000}-10-06 | 10-16 | 11-11 | 11-20 |
| IA3290 | GLENWOOD | -33 | 30 | {1902}-09-12 | 28 | {1902}-09-13 | 10-19 | 11-08 | 11-21 |
| IA3293 | GLENWOOD 5 ESE | -30 | 32 | {1902}-09-13 | 26 | {1942}-09-28 | 10-23 | 11-08 | 11-22 |
| IA3295 | GLENWOOD 8 SSE | -23 | 30 | {1951}-09-28 | 28 | {1952}-10-06 | 10-26 | 11-09 | 11-22 |
| IA3434 | GREENE | -29 | 32 | {1902}-09-13 | 25 | {1908}-09-29 | 10-11 | 10-28 | 11-11 |
| IA3438 | GREENFIELD | -34 | 32 | {1981}-09-17 | 27 | {1913}-09-22 | 10-24 | 11-08 | 11-21 |
| IA3455 | GRIMES 3 E | -21 | 31 | {2012}-09-23 | 27 | {2003}-10-02 | 10-24 | 11-11 | 11-20 |
| IA3459 | GRIMES 4 WSW | -22 | 31 | {2012}-09-23 | 27 | {2003}-10-02 | 10-16 | 11-11 | 11-20 |
| IA3473 | GRINNELL-3-SW | -35 | 31 | {1976}-09-10 | 27 | {1991}-09-20 | 10-17 | 11-05 | 11-13 |
| IA3475 | GRINNELL NEAR | -29 | 24 | {1899}-09-29 | 24 | {1899}-09-29 | 10-17 | 11-05 | 11-14 |
| IA3487 | GRUNDY-CENTER | -34 | 32 | {1902}-09-12 | 28 | {1929}-09-18 | 10-17 | 11-03 | 11-11 |
| IA3509 | GUTHRIE-CENTER | -35 | 31 | {1902}-09-12 | 28 | {1991}-09-19 | 10-17 | 11-07 | 11-11 |
| IA3517 | GUTTENBERG-L-AND-D-10 | -38 | 32 | {1973}-09-18 | 25 | {1942}-09-28 | 10-24 | 11-10 | 11-21 |
| IA3562 | HAMBURG | -29 | 31 | {1901}-09-18 | 28 | {1942}-09-28 | 10-25 | 11-12 | 11-22 |
| IA3567 | HAMBURG | -22 | 32 | {1974}-10-01 | 28 | {1976}-10-16 | 10-15 | 11-14 | 11-21 |
| IA3569 | HAMBURG 2 NE | -16 | 29 | {2004}-10-02 | 28 | {2012,2000}-10-06 | 10-24 | 11-11 | 11-20 |
| IA3584 | HAMPTON-2-NW | -35 | 32 | {1955}-09-11 | 28 | {1955}-09-12 | 10-17 | 11-02 | 11-11 |
| IA3589 | HANCOCK | -32 | 31 | {1991}-09-19 | 25 | {1942}-09-28 | 10-24 | 11-10 | 11-21 |
| IA3590 | HANCOCK 7SE | -14 | 31 | {2006}-10-11 | 27 | {2006}-10-12 | 10-11 | 10-23 | 11-01 |
| IA3600 | HANLONTOWN | -31 | 32 | {1903}-09-24 | 24 | {1904}-10-06 | 10-05 | 10-27 | 10-27 |
| IA3623 | HARCOURT 2ENE | -30 | 32 | {2007}-09-15 | 28 | {1984}-09-29 | 10-18 | 11-07 | 11-11 |
| IA3632 | HARLAN | -37 | 29 | {1902}-09-12 | 27 | {1902}-09-13 | 10-18 | 11-04 | 11-12 |
| IA3667 | HARTLEY 3 S | -18 | 30 | {1947}-09-22 | 25 | {1945}-09-29 | 09-29 | 11-08 | 11-09 |
| IA3671 | HARTWICK 4NW | -22 | 31 | {2012}-09-23 | 24 | {2003}-10-02 | 10-25 | 11-11 | 11-20 |
| IA3675 | HASTINGS 4NE | -26 | 32 | {2009}-10-04 | 22 | {2012}-10-07 | 10-15 | 11-07 | 11-11 |
| IA3681 | HAVEN 1 NE | -23 | 31 | {2012}-09-23 | 24 | {2003}-10-02 | 10-25 | 11-11 | 11-20 |
| IA3712 | HAVERHILL | -23 | 32 | {1974}-09-22 | 25 | {1974}-10-02 | 10-19 | 11-10 | 11-21 |
| IA3718 | HAWARDEN | -33 | 32 | {2013}-09-02 | 24 | {1991}-09-19 | 10-14 | 11-01 | 11-07 |
| IA3731 | HAWKEYE | -30 | 30 | {1896}-09-20 | 20 | {1899}-09-30 | 10-07 | 11-02 | 11-06 |
| IA3819 | HEDRICK | -23 | 27 | {1899}-09-29 | 27 | {1899}-09-29 | 10-17 | 11-02 | 11-06 |
| IA3877 | HINTON 4 W | -23 | 28 | {1951}-09-28 | 28 | {1951}-09-28 | 09-28 | 11-02 | 11-10 |
| IA3900 | HORNICK 4 NNE | -28 | 30 | {1991}-09-19 | 28 | {1984}-09-26 | 10-18 | 11-07 | 11-11 |
| IA3909 | Holstein | -27 | 31 | {1991}-09-20 | 28 | {1984}-09-29 | 10-19 | 11-10 | 11-21 |
| IA3910 | HOLSTEIN 5 NNW | -27 | 30 | {2020}-10-02 | 28 | {2019}-10-12 | 10-08 | 10-27 | 10-31 |
| IA3933 | HOPEVILLE | -30 | 32 | {1901}-09-18 | 27 | {1908,1899}-09-29 | 10-27 | 11-10 | 11-12 |
| IA3944 | HORNICK 5S | -20 | 30 | {1951}-09-28 | 26 | {1948}-10-17 | 10-12 | 11-09 | 11-10 |
| IA3946 | HORNICK 1 E | -20 | 31 | {2012}-09-23 | 28 | {2004}-10-02 | 10-14 | 10-31 | 11-20 |
| IA3960 | HUBBARD | -25 | 32 | {2007}-09-15 | 28 | {1984}-09-29 | 10-18 | 11-09 | 11-12 |
| IA3964 | HUDSON | -26 | 32 | {2007}-09-15 | 23 | {2003}-10-02 | 10-16 | 11-07 | 11-12 |
| IA3980 | HUMBOLDT-2 | -42 | 31 | {1902}-09-13 | 28 | {1934}-09-16 | 10-17 | 11-02 | 11-11 |
| IA3985 | HUMBOLDT 2 | -27 | 30 | {1991}-09-19 | 25 | {1987}-10-03 | 10-03 | 10-19 | 11-06 |
| IA4038 | IDA GROVE 5NW | -36 | 32 | {1974}-09-03 | 27 | {1918}-09-20 | 10-17 | 11-02 | 11-10 |
| IA4049 | INDEPENDENCE-2-W | -31 | 32 | {1974}-09-03 | 28 | {1975}-09-13 | 10-17 | 11-03 | 11-12 |
| IA4052 | INDEPENDENCE | -32 | 32 | {1974}-09-03 | 28 | {1975}-09-13 | 10-17 | 11-05 | 11-12 |
| IA4063 | INDIANOLA-2-SSW | -35 | 30 | {1979}-09-15 | 28 | {1979}-09-22 | 10-19 | 11-08 | 11-21 |
| IA4067 | INDIANOLA 5 NNW | -24 | 31 | {1995}-09-22 | 24 | {1942}-09-28 | 10-25 | 11-10 | 11-21 |
| IA4087 | INWOOD 2 SW | -46 | 30 | {1940}-09-11 | 27 | {1902}-09-12 | 10-12 | 10-28 | 11-08 |
| IA4094 | IONIA 2 W | -31 | 31 | {2007}-09-15 | 21 | {2003}-10-02 | 10-13 | 11-01 | 11-11 |
| IA4101 | Iowa City | -32 | 32 | {1923}-09-14 | 28 | {1916}-09-18 | 10-20 | 11-10 | 11-22 |
| IA4102 | IOWA CITY 2 | -23 | 32 | {2012}-09-23 | 24 | {2003}-10-02 | 10-25 | 11-12 | 11-21 |
| IA4106 | IOWA CITY MUNICIPAL AP | -34 | 32 | {1991}-09-20 | 26 | {1995}-09-23 | 10-19 | 11-10 | 11-21 |
| IA4109 | IOWA CITY (MRS HOBBY) | -18 | 30 | {1896}-09-20 | 26 | {1896}-10-18 | 09-20 | 10-21 | 11-06 |
| IA4111 | IOWA CITY RALSTON CREEK | -17 | 32 | {1949}-09-29 | 27 | {1948}-10-17 | 10-24 | 11-10 | 11-20 |
| IA4116 | IOWA CITY RALSTON CREEK | -17 | 32 | {1949}-09-29 | 27 | {1948}-10-17 | 10-24 | 11-10 | 11-20 |
| IA4121 | IOWA CITY RALSTON CREEK | -17 | 32 | {1949}-09-29 | 27 | {1948}-10-17 | 10-24 | 11-10 | 11-20 |
| IA4126 | IOWA CITY RALSTON CREEK | -17 | 32 | {1949}-09-29 | 27 | {1948}-10-17 | 10-24 | 11-10 | 11-20 |
| IA4131 | IOWA CITY RALSTON CREEK | -17 | 32 | {1949}-09-29 | 27 | {1948}-10-17 | 10-24 | 11-10 | 11-20 |
| IA4139 | IOWA CITY 5 SW | -23 | 32 | {2012}-09-23 | 24 | {2003}-10-02 | 10-17 | 11-12 | 11-23 |
| IA4142 | IOWA-FALLS | -34 | 31 | {1915}-08-30 | 28 | {1894}-09-18 | 10-17 | 11-02 | 11-11 |
| IA4174 | IRWIN 3 ESE | -25 | 31 | {1991}-09-19 | 27 | {1984}-09-29 | 10-24 | 11-10 | 11-21 |
| IA4202 | JAMES 1 NE | -26 | 32 | {2011}-09-15 | 27 | {1984}-09-26 | 10-18 | 11-03 | 11-16 |
| IA4228 | JEFFERSON | -37 | 32 | {1893}-08-29 | 28 | {1929}-09-18 | 10-18 | 11-07 | 11-12 |
| IA4229 | JEFFERSON 2 S | -25 | 32 | {2007}-09-15 | 26 | {2003}-10-02 | 10-15 | 11-01 | 11-11 |
| IA4244 | JEWELL | -26 | 32 | {2007}-09-15 | 28 | {1984}-09-29 | 10-19 | 11-07 | 11-20 |
| IA4280 | KALONA 1 SSW | -22 | 32 | {2012}-09-23 | 24 | {2003}-10-02 | 10-27 | 11-12 | 11-24 |
| IA4308 | KANAWHA | -27 | 31 | {2011,2007}-09-15 | 27 | {1974}-09-22 | 10-18 | 11-06 | 11-19 |
| IA4342 | KENNEBEC | -25 | 31 | {1991}-09-19 | 26 | {1984}-09-29 | 10-24 | 11-07 | 11-20 |
| IA4372 | KEOKUK NO 2 | -23 | 25 | {1935}-10-04 | 25 | {1935}-10-04 | 10-23 | 11-06 | 11-22 |
| IA4376 | KEOKUK LOCK & DAM 19 | -14 | 24 | {1952}-10-06 | 24 | {1952}-10-06 | 11-03 | 11-21 | 11-22 |
| IA4381 | KEOKUK LOCK DAM 19 | -27 | 30 | {1992}-09-23 | 23 | {1952}-10-06 | 11-02 | 11-21 | 11-28 |
| IA4389 | KEOSAUQUA | -36 | 31 | {1917}-09-11 | 28 | {1916}-09-18 | 10-24 | 11-11 | 11-22 |
| IA4394 | KEOSAUQUA 2 | -21 | 32 | {1942}-09-24 | 25 | {1942}-09-28 | 10-28 | 11-19 | 11-22 |
| IA4402 | KESLEY | -26 | 31 | {2007}-09-15 | 23 | {2003}-10-02 | 10-14 | 11-07 | 11-11 |
| IA4433 | KILLDUFF | -23 | 32 | {1984}-09-26 | 28 | {1979}-10-13 | 10-19 | 11-12 | 11-12 |
| IA4502 | KNOXVILLE | -30 | 31 | {1916}-09-18 | 28 | {1926}-09-26 | 10-25 | 11-11 | 11-22 |
| IA4507 | KNOXVILLE 3E | -19 | 32 | {2012}-09-23 | 27 | {2003}-10-02 | 10-26 | 11-11 | 11-20 |
| IA4523 | LACONA | -29 | 32 | {1918}-09-21 | 25 | {1899}-09-29 | 10-21 | 11-11 | 11-22 |
| IA4529 | LADORA | -23 | 31 | {2012}-09-23 | 24 | {2003}-10-02 | 10-25 | 11-11 | 11-20 |
| IA4547 | LAKE CITY | -26 | 32 | {1947}-09-22 | 23 | {1942}-09-28 | 10-23 | 11-03 | 11-19 |
| IA4557 | LAKE MILLS | -30 | 30 | {2007}-09-15 | 26 | {1974}-09-22 | 10-16 | 11-04 | 11-11 |
| IA4561 | LAKE PARK | -38 | 30 | {1940}-09-12 | 28 | {1916}-09-15 | 10-12 | 11-01 | 11-08 |
| IA4569 | LAKE VIEW | -22 | 28 | {1942}-09-24 | 28 | {1942}-09-24 | 10-24 | 11-03 | 11-21 |
| IA4585 | Lamoni | -29 | 32 | {1901}-09-18 | 27 | {1942}-09-28 | 10-25 | 11-10 | 11-22 |
| IA4587 | LAMONI | -20 | -1 | {2011,2012}-08-07 | -1 | {2011,2012}-08-07 | 10-27 | 11-11 | 11-21 |
| IA4620 | LANSING | -33 | 30 | {1902}-09-12 | 28 | {1902}-09-13 | 10-19 | 11-05 | 11-12 |
| IA4624 | LANSING 4SE | -28 | 32 | {2007}-09-15 | 22 | {2003}-10-02 | 10-15 | 11-01 | 11-23 |
| IA4637 | LARCHWOOD | -36 | 27 | {1902}-09-12 | 27 | {1902}-09-12 | 09-17 | 10-17 | 11-05 |
| IA4644 | LARRABEE | -38 | 29 | {1902}-09-12 | 28 | {1896}-09-19 | 10-12 | 11-01 | 11-08 |
| IA4700 | LE CLAIRE | -28 | 32 | {1896,1918}-09-20 | 25 | {1942}-09-28 | 10-23 | 11-11 | 11-22 |
| IA4705 | Le Claire L&D 14 | -28 | 32 | {1942}-09-26 | 28 | {1942}-09-28 | 10-29 | 11-20 | 11-27 |
| IA4735 | Le Mars | -37 | 31 | {1955}-09-11 | 28 | {1902}-09-12 | 10-16 | 11-01 | 11-10 |
| IA4746 | LENOX | -37 | 32 | {1904}-09-13 | 28 | {1913}-09-22 | 10-23 | 11-08 | 11-21 |
| IA4758 | LEON 6 ESE | -36 | 32 | {1986}-09-08 | 28 | {1991}-09-19 | 10-24 | 11-11 | 11-22 |
| IA4820 | LINN GROVE | -27 | 31 | {2011,2007}-09-15 | 27 | {2003}-10-01 | 10-14 | 10-31 | 11-11 |
| IA4867 | LITTLE SIOUX | -39 | 24 | {1916}-09-15 | 24 | {1916}-09-15 | 10-19 | 11-02 | 11-11 |
| IA4874 | LITTLE SIOUX 2NW | -31 | 31 | {2007}-09-15 | 27 | {2012}-09-23 | 10-08 | 10-28 | 11-11 |
| IA4894 | LOGAN | -35 | 30 | {1902}-09-12 | 28 | {1902}-09-13 | 10-18 | 11-04 | 11-12 |
| IA4898 | LOGAN NO 2 | -25 | 31 | {1991}-09-19 | 28 | {1942}-09-24 | 10-24 | 11-10 | 11-21 |
| IA4912 | LONE TREE 5 SW | -22 | 32 | {2003}-09-29 | 24 | {2003}-10-02 | 10-17 | 11-17 | 11-23 |
| IA4926 | LORIMOR | -23 | 30 | {1995}-09-22 | 28 | {2004,2003}-10-02 | 10-26 | 11-10 | 11-23 |
| IA4963 | LOWDEN | -37 | 32 | {2014}-09-13 | 26 | {2012}-09-24 | 10-16 | 11-01 | 11-12 |
| IA5000 | MADRID | -32 | 32 | {1902}-09-13 | 28 | {1913}-09-22 | 10-20 | 11-08 | 11-12 |
| IA5085 | MANCHESTER | -23 | 31 | {1991}-09-20 | 27 | {1987}-10-03 | 10-09 | 11-05 | 11-07 |
| IA5086 | MANCHESTER-2 | -36 | 32 | {2014}-09-13 | 27 | {1984}-09-16 | 10-17 | 11-04 | 11-12 |
| IA5123 | MAPLETON NO. 2 | -35 | 31 | {1955}-09-11 | 27 | {1991}-09-19 | 10-15 | 11-02 | 11-10 |
| IA5127 | MAPLETON | -25 | 31 | {1991}-09-19 | 26 | {1984}-09-29 | 10-19 | 11-07 | 11-20 |
| IA5131 | MAQUOKETA-2-W | -37 | 31 | {1917}-09-11 | 28 | {1983}-09-23 | 10-17 | 11-06 | 11-13 |
| IA5132 | MAQUOKETA 2 NE | -27 | 32 | {2003}-09-29 | 23 | {2003}-10-02 | 10-15 | 11-17 | 11-24 |
| IA5136 | MARATHON | -26 | 29 | {1929}-09-18 | 21 | {1935}-10-04 | 09-27 | 11-02 | 11-06 |
| IA5141 | MARBLE ROCK | -30 | 30 | {1991}-09-20 | 26 | {1974}-09-22 | 10-18 | 11-04 | 11-12 |
| IA5150 | MARENGO | -23 | 31 | {2012}-09-23 | 24 | {2003}-10-02 | 10-16 | 11-11 | 11-12 |
| IA5163 | MARION 4 NE | -18 | 32 | {1949}-09-29 | 27 | {1948}-10-17 | 10-23 | 11-10 | 11-20 |
| IA5193 | MARSHALLTOWN 1 | -24 | 28 | {1948}-10-04 | 28 | {1948}-10-04 | 09-27 | 10-04 | 10-17 |
| IA5198 | MARSHALLTOWN | -35 | 31 | {1955}-09-12 | 28 | {1896}-09-20 | 10-17 | 11-05 | 11-12 |
| IA5199 | MARSHALLTOWN MUNICIPAL AP | -28 | 30 | {2007}-09-15 | 27 | {2012}-09-23 | 10-14 | 11-02 | 11-11 |
| IA5200 | MARSHALLTOWN 4 SE | -23 | 30 | {2012}-09-23 | 25 | {2003}-10-02 | 10-16 | 11-10 | 11-20 |
| IA5206 | MARSHALLTOWN #2 | -14 | 32 | {1949}-09-24 | 27 | {1949}-09-29 | 09-29 | 10-24 | 11-21 |
| IA5230 | Mason City | -45 | 30 | {1915}-08-30 | 28 | {1923}-09-14 | 10-12 | 11-02 | 11-10 |
| IA5232 | MASON CITY #1 | -26 | 31 | {2011,2007}-09-15 | 28 | {2003}-10-01 | 10-14 | 11-07 | 11-11 |
| IA5235 | MASON CITY MUNICIPAL AP | -32 | 31 | {2014}-09-13 | 26 | {2011}-09-15 | 10-09 | 11-02 | 11-10 |
| IA5250 | MASSENA | -32 | 32 | {1904}-09-16 | 25 | {1942}-09-28 | 10-24 | 11-10 | 11-21 |
| IA5270 | MATLOCK | -32 | 29 | {1916}-09-15 | 26 | {1916}-09-29 | 09-28 | 10-08 | 10-10 |
| IA5290 | MAXON | -28 | 31 | {1895}-10-08 | 23 | {1895}-10-09 | 10-09 | 10-28 | 10-29 |
| IA5295 | MAXWELL | -25 | 31 | {2012}-09-23 | 26 | {2003}-10-02 | 10-15 | 11-10 | 11-12 |
| IA5315 | MCGREGOR | -25 | 30 | {1967}-09-29 | 24 | {1964}-10-10 | 10-24 | 11-05 | 11-18 |
| IA5320 | MCGREGOR NO 2 | -28 | 32 | {2007}-09-15 | 22 | {2003}-10-02 | 10-15 | 11-11 | 11-23 |
| IA5341 | MECHANICSVILLE | -10 | 30 | {1896}-10-07 | 24 | {1896}-10-18 | 09-19 | 10-07 | 10-18 |
| IA5383 | MELROSE | -28 | 32 | {1918}-09-21 | 25 | {1942}-09-28 | 10-23 | 11-11 | 11-22 |
| IA5414 | MERRILL | -38 | 31 | {1916}-09-15 | 25 | {1918}-09-20 | 10-18 | 11-02 | 11-10 |
| IA5418 | MERRILL 4 WSW | -38 | 31 | {1916}-09-15 | 25 | {1918}-09-20 | 10-19 | 11-02 | 11-11 |
| IA5493 | Milford | -34 | 32 | {1974}-09-03 | 28 | {1929}-09-18 | 10-14 | 11-02 | 11-09 |
| IA5496 | MILFORD 3 W | -28 | 31 | {2007}-09-15 | 26 | {2003}-10-01 | 10-09 | 10-27 | 11-10 |
| IA5517 | MILLERTON | -31 | 30 | {1901}-09-18 | 25 | {1913}-09-22 | 10-23 | 11-11 | 11-22 |
| IA5552 | MINEOLA 5 NW | -13 | 30 | {1999}-10-04 | 27 | {2000}-10-06 | 10-17 | 11-10 | 11-11 |
| IA5584 | MISSOURI VALLEY 1 NNE | -22 | 32 | {1940}-09-11 | 28 | {1942}-09-24 | 10-24 | 11-03 | 11-21 |
| IA5608 | MONDAMIN | -23 | 31 | {1943}-09-20 | 28 | {1942}-09-24 | 10-22 | 10-26 | 11-09 |
| IA5622 | MONMOUTH 4 SW | -27 | 32 | {1952}-09-20 | 26 | {1950}-09-24 | 10-15 | 11-03 | 11-11 |
| IA5630 | MONONA | -33 | 32 | {1950}-09-24 | 27 | {1949}-09-29 | 10-04 | 11-10 | 11-11 |
| IA5638 | MONROE | -32 | 32 | {1929}-09-18 | 24 | {1942}-09-28 | 10-21 | 11-08 | 11-22 |
| IA5650 | MONTEZUMA 1 W | -29 | 32 | {1902}-09-13 | 28 | {1926}-09-26 | 10-24 | 11-10 | 11-21 |
| IA5664 | MONTICELLO | -30 | 32 | {1902}-09-12 | 28 | {1893}-09-26 | 10-07 | 10-27 | 11-03 |
| IA5669 | MONTICELLO | -30 | 32 | {1902}-09-12 | 27 | {1926}-09-26 | 10-19 | 11-09 | 11-21 |
| IA5680 | MOOAR | -21 | 32 | {1896}-09-19 | 28 | {1899}-09-29 | 10-07 | 11-02 | 11-06 |
| IA5732 | MORSE | -18 | 32 | {1949}-09-29 | 26 | {1948}-10-17 | 10-24 | 11-10 | 11-20 |
| IA5737 | MORSE 1 NE | -18 | 32 | {1949}-09-29 | 26 | {1948}-10-17 | 10-24 | 11-10 | 11-20 |
| IA5742 | MORSE 4 SSW | -17 | 32 | {1949}-09-29 | 27 | {1948}-10-17 | 10-24 | 11-10 | 11-20 |
| IA5750 | MOULTON 5 W | -18 | 32 | {2012}-09-23 | 28 | {2003}-10-02 | 10-27 | 11-12 | 11-21 |
| IA5769 | MOUNT-AYR | -30 | 32 | {1902}-09-13 | 28 | {1991}-09-19 | 10-24 | 11-10 | 11-21 |
| IA5796 | MOUNT-PLEASANT | -27 | 32 | {1902}-09-13 | 28 | {1942}-09-24 | 10-25 | 11-11 | 11-22 |
| IA5811 | MOUNT VERNON | -26 | 31 | {1896}-09-20 | 21 | {1899}-09-30 | 10-06 | 10-31 | 11-06 |
| IA5813 | MOUNT VERNON | -30 | 32 | {1907}-09-25 | 27 | {1899}-09-30 | 10-19 | 11-06 | 11-14 |
| IA5823 | MOVILLE | -21 | 29 | {1951}-09-28 | 28 | {1948}-10-16 | 09-28 | 11-08 | 11-10 |
| IA5834 | MURRAY | -31 | 32 | {1901}-09-18 | 28 | {1913}-09-22 | 10-25 | 11-11 | 11-13 |
| IA5837 | MUSCATINE | -34 | 29 | {1991}-09-20 | 23 | {1942}-09-28 | 10-25 | 11-11 | 11-22 |
| IA5842 | MUSCATINE 2 | -29 | 32 | {1991,1896}-09-20 | 25 | {1942}-09-28 | 10-25 | 11-12 | 11-23 |
| IA5844 | MUSCATINE 2N | -25 | 27 | {2003}-10-02 | 27 | {2003}-10-02 | 10-17 | 11-12 | 11-22 |
| IA5847 | MUSCATINE 6 N | -14 | 32 | {1949}-09-29 | 26 | {1948}-10-17 | 10-16 | 11-15 | 11-21 |
| IA5872 | NASHUA 2 NW | -25 | 28 | {1949}-09-29 | 28 | {1949}-09-29 | 09-24 | 10-25 | 11-03 |
| IA5876 | NASHUA 2 SW | -31 | 31 | {2007}-09-15 | 22 | {2003}-10-02 | 10-13 | 11-01 | 11-12 |
| IA5880 | NEOLA | -16 | 32 | {1896}-09-18 | 28 | {1896}-10-05 | 10-05 | 10-19 | 11-02 |
| IA5882 | NEVADA | -17 | 32 | {1907}-09-25 | 24 | {1906}-10-10 | 10-10 | 10-11 | 10-28 |
| IA5952 | NEW-HAMPTON | -34 | 28 | {1949}-09-01 | 28 | {1949}-09-01 | 10-17 | 11-02 | 11-11 |
| IA5992 | NEWTON | -34 | 32 | {1929}-09-18 | 23 | {1942}-09-28 | 10-24 | 11-08 | 11-21 |
| IA6044 | NORA SPRINGS | -29 | 30 | {1918}-09-21 | 25 | {1913}-09-22 | 10-19 | 10-30 | 11-09 |
| IA6062 | NORTHBORO | -29 | 31 | {1901}-09-18 | 27 | {1899}-09-29 | 10-26 | 11-12 | 11-15 |
| IA6076 | NORTH ENGLISH | -27 | 32 | {1995,1974}-09-22 | 24 | {2003}-10-02 | 10-19 | 11-10 | 11-21 |
| IA6086 | NORTH MCGREGOR | -24 | 30 | {1896}-09-20 | 26 | {1896}-10-07 | 09-20 | 09-20 | 11-06 |
| IA6103 | NORTHWOOD | -37 | 32 | {1953}-09-13 | 28 | {1929}-09-18 | 10-10 | 11-02 | 11-10 |
| IA6119 | NORWICH EXPERIMENT FARM | -23 | 29 | {1942}-09-24 | 26 | {1942}-09-28 | 10-24 | 11-03 | 11-20 |
| IA6151 | OAKLAND-2-E | -31 | 32 | {1974}-09-03 | 28 | {1995}-09-22 | 10-17 | 11-06 | 11-12 |
| IA6160 | OAKLAND MILLS 3 W | -24 | 26 | {2003}-10-02 | 26 | {2003}-10-02 | 10-27 | 11-12 | 11-24 |
| IA6186 | OASIS 1 NW | -17 | 32 | {1949}-09-29 | 27 | {1948}-10-17 | 10-24 | 11-10 | 11-20 |
| IA6190 | OCHEYEDAN | -28 | 31 | {1973}-08-22 | 27 | {1974}-09-22 | 10-15 | 11-03 | 11-10 |
| IA6195 | ODEBOLT 2 | -37 | 31 | {1902}-09-12 | 28 | {1918}-09-20 | 10-21 | 11-02 | 11-13 |
| IA6196 | ODEBOLT | -35 | 30 | {1902}-09-12 | 26 | {1913}-09-22 | 10-11 | 10-27 | 11-11 |
| IA6199 | OELWEIN 1E | -33 | 32 | {2011}-09-15 | 28 | {2012}-10-05 | 10-14 | 11-01 | 11-12 |
| IA6200 | OELWEIN-2-S | -32 | 20 | {1942}-09-05 | 20 | {1942}-09-05 | 10-17 | 11-03 | 11-11 |
| IA6205 | OGDEN | -33 | 31 | {1902}-09-05 | 27 | {1913}-09-22 | 10-21 | 11-08 | 11-19 |
| IA6209 | OGDEN | -23 | 32 | {2007}-09-15 | 26 | {2003}-10-02 | 10-15 | 11-07 | 11-11 |
| IA6225 | OLIN | -35 | 31 | {1902}-09-13 | 25 | {1926}-09-26 | 10-20 | 11-02 | 11-12 |
| IA6243 | ONAWA | -32 | 24 | {1936}-08-29 | 24 | {1936}-08-29 | 10-19 | 11-03 | 11-11 |
| IA6273 | ORANGE CITY | -26 | 31 | {2011}-09-15 | 28 | {2012}-10-05 | 10-12 | 10-28 | 10-31 |
| IA6291 | ORLEANS | -30 | 29 | {1935}-09-27 | 20 | {1935}-10-04 | 10-06 | 10-22 | 10-22 |
| IA6305 | OSAGE | -35 | 30 | {1949}-09-14 | 28 | {1929}-09-18 | 10-17 | 11-03 | 11-11 |
| IA6316 | OSCEOLA-3-WSW | -32 | 31 | {2007}-09-15 | 28 | {1974}-09-22 | 10-19 | 11-10 | 11-21 |
| IA6327 | OSKALOOSA | -31 | 31 | {1902}-09-13 | 27 | {1991}-09-20 | 10-24 | 11-10 | 11-21 |
| IA6335 | OSKALOOSA 4 N | -19 | 31 | {2012}-09-23 | 26 | {2003}-10-02 | 10-26 | 11-11 | 11-20 |
| IA6363 | OTO | -24 | 30 | {1943}-09-20 | 28 | {1942}-09-24 | 10-22 | 11-03 | 11-10 |
| IA6386 | OTTUMWA 1 WSW | -36 | 8 | {1895}-09-01 | 8 | {1895}-09-01 | 10-23 | 11-11 | 11-22 |
| IA6389 | Ottumwa | -36 | 32 | {2007}-09-15 | 23 | {1942}-09-28 | 10-24 | 11-11 | 11-22 |
| IA6391 | OTTUMWA | -24 | 32 | {1918}-09-21 | 24 | {1942}-09-28 | 10-24 | 11-12 | 11-22 |
| IA6392 | OTTUMWA #1 | -21 | 32 | {2012}-09-23 | 26 | {2003}-10-02 | 10-27 | 11-11 | 11-26 |
| IA6396 | OTTUMWA | -18 | 32 | {2012}-09-23 | 26 | {2003}-10-02 | 10-27 | 11-12 | 11-21 |
| IA6412 | OVID | -25 | 30 | {1901}-09-18 | 23 | {1899}-09-29 | 10-16 | 11-03 | 11-15 |
| IA6418 | PANORA | -20 | 30 | {2012}-09-23 | 26 | {2003}-10-02 | 10-16 | 11-10 | 11-20 |
| IA6419 | OXFORD JUNCTION 1 S | -26 | 32 | {2012}-09-23 | 26 | {2009}-10-10 | 10-25 | 11-12 | 11-21 |
| IA6440 | PACIFIC JUNCTION | -37 | 32 | {1902}-09-12 | 27 | {1901}-09-18 | 10-20 | 11-02 | 11-12 |
| IA6492 | PARKERSBURG | -29 | 32 | {2007}-09-15 | 27 | {1974}-09-22 | 10-17 | 11-05 | 11-12 |
| IA6520 | PAULLINA | -26 | 31 | {1991}-09-19 | 28 | {1984}-09-26 | 10-18 | 11-04 | 11-18 |
| IA6527 | PELLA 1S | -32 | 32 | {1902}-09-13 | 26 | {1913}-09-22 | 10-24 | 11-11 | 11-22 |
| IA6531 | PELLA 4 WSW | -19 | 27 | {2003}-10-02 | 27 | {2003}-10-02 | 10-16 | 11-16 | 11-20 |
| IA6566 | PERRY | -34 | 32 | {1955}-09-12 | 27 | {1929}-09-18 | 10-17 | 11-06 | 11-11 |
| IA6590 | PETERSON | -27 | 31 | {2007}-09-15 | 28 | {1942}-09-24 | 10-18 | 11-04 | 11-19 |
| IA6618 | PIONEER | -30 | 22 | {1899}-09-29 | 22 | {1899}-09-29 | 09-30 | 11-02 | 11-02 |
| IA6634 | PISGAH | -25 | 31 | {1991}-09-19 | 27 | {1984}-09-29 | 10-24 | 11-10 | 11-20 |
| IA6698 | PLOVER | -36 | 32 | {1902}-09-04 | 26 | {1902}-09-12 | 10-09 | 10-27 | 11-02 |
| IA6719 | POCAHONTAS | -36 | 31 | {1946}-09-02 | 27 | {1929}-09-18 | 10-16 | 11-01 | 11-10 |
| IA6755 | POPEJOY 1S | -26 | 32 | {2007}-09-15 | 28 | {1984}-09-26 | 10-18 | 11-07 | 11-11 |
| IA6760 | PORTSMOUTH | -18 | 32 | {1896}-09-19 | 25 | {1896}-10-18 | 09-19 | 09-20 | 11-02 |
| IA6766 | Postville | -35 | 32 | {1919}-09-02 | 20 | {1918}-09-21 | 10-17 | 11-05 | 11-11 |
| IA6800 | PRIMGHAR | -38 | 30 | {1902}-09-12 | 25 | {1901}-09-18 | 10-17 | 11-02 | 11-10 |
| IA6820 | PROMISE CITY 6 NW | -23 | 31 | {1995}-09-22 | 28 | {1974}-10-02 | 11-01 | 11-11 | 11-23 |
| IA6891 | RANDOLPH | -25 | 32 | {1991}-09-19 | 27 | {1984}-09-29 | 10-25 | 11-11 | 11-23 |
| IA6895 | RANDOLPH 1 W | -17 | 29 | {2004}-10-02 | 28 | {2000,2012}-10-06 | 10-24 | 11-11 | 11-20 |
| IA6910 | RATHBUN DAM | -28 | 32 | {1974}-09-22 | 28 | {1985}-10-01 | 10-19 | 11-11 | 11-21 |
| IA6920 | REDFIELD 2 E | -24 | 30 | {1995}-09-22 | 27 | {2003}-10-02 | 10-24 | 11-10 | 11-21 |
| IA6940 | RED-OAK | -30 | 32 | {1940}-09-11 | 28 | {1995}-09-22 | 10-19 | 11-10 | 11-21 |
| IA6941 | READ OAK # 2 | -23 | 32 | {1991}-09-19 | 28 | {1984}-09-29 | 10-24 | 11-10 | 11-21 |
| IA6945 | RED OAK 10 SW | -23 | 29 | {1942}-09-24 | 27 | {1942}-09-28 | 10-23 | 11-06 | 11-21 |
| IA6965 | RED ROCK DAM | -19 | 29 | {1984}-09-29 | 26 | {1987}-10-11 | 10-28 | 11-10 | 11-10 |
| IA6969 | REINBECK 2 W | -20 | 32 | {1896}-09-20 | 28 | {1896}-10-07 | 09-19 | 09-28 | 10-18 |
| IA6975 | REMSEN | -22 | 28 | {1951}-09-28 | 28 | {1951}-09-28 | 09-28 | 10-24 | 11-10 |
| IA6976 | REMSEN NO. 2 | -27 | 32 | {2011}-09-15 | 28 | {2012}-10-05 | 10-12 | 10-27 | 11-11 |
| IA6985 | RHODES 3E | -25 | 31 | {1995}-09-22 | 25 | {1974}-10-02 | 10-18 | 11-10 | 11-20 |
| IA7035 | RIDGEWAY | -35 | 32 | {1903}-09-18 | 28 | {1907}-09-25 | 10-12 | 10-28 | 11-11 |
| IA7058 | RINGSTED | -27 | 30 | {2007}-09-15 | 27 | {1974}-09-22 | 10-16 | 11-04 | 11-12 |
| IA7085 | RIVERTON | -22 | 30 | {1942}-09-24 | 26 | {1942}-09-28 | 10-24 | 11-06 | 11-21 |
| IA7147 | ROCK-RAPIDS | -40 | 31 | {1974}-09-03 | 26 | {1894}-09-10 | 10-08 | 10-27 | 11-05 |
| IA7152 | ROCK VALLEY | -27 | 31 | {2011}-09-15 | 28 | {1995}-09-22 | 10-13 | 10-31 | 11-10 |
| IA7161 | ROCKWELL-CITY | -35 | 32 | {1902}-09-12 | 28 | {1929}-09-18 | 10-17 | 11-03 | 11-11 |
| IA7167 | ROCKWELL CITY NO. 2 | -26 | 32 | {2007}-09-15 | 25 | {2003}-10-02 | 10-13 | 10-31 | 11-11 |
| IA7256 | RUNNELLS 2SE | -13 | 27 | {2003}-10-02 | 27 | {2003}-10-02 | 10-06 | 11-11 | 11-20 |
| IA7289 | RUTHVEN | -38 | 31 | {1902}-09-12 | 26 | {1899}-09-22 | 10-07 | 11-03 | 11-09 |
| IA7312 | SAC-CITY | -35 | 32 | {1974}-09-03 | 28 | {1918}-09-20 | 10-17 | 11-02 | 11-11 |
| IA7326 | ST ANSGAR | -32 | 31 | {2007}-09-15 | 25 | {1974}-09-22 | 10-16 | 11-04 | 11-12 |
| IA7340 | ST CHARLES | -32 | 29 | {1913}-09-22 | 24 | {1942}-09-28 | 10-24 | 11-11 | 11-22 |
| IA7363 | SALEM 1 S | -21 | 31 | {2012}-10-06 | 26 | {2022}-10-18 | 10-19 | 11-11 | 11-12 |
| IA7386 | SANBORN | -35 | 32 | {1974}-09-03 | 25 | {1929}-09-18 | 10-13 | 11-01 | 11-08 |
| IA7410 | SARATOGA 2 E | -40 | 32 | {1964}-08-14 | 27 | {1955}-09-11 | 09-28 | 10-24 | 11-03 |
| IA7425 | SAYLORVILLE 3WNW | -21 | 31 | {2012}-09-23 | 27 | {2003}-10-02 | 10-24 | 11-11 | 11-20 |
| IA7478 | SCRANTON | -27 | 32 | {1902}-09-12 | 24 | {1899}-09-29 | 10-16 | 11-02 | 11-06 |
| IA7526 | SEYMOUR | -15 | 30 | {1896}-10-07 | 28 | {1896}-10-18 | 09-20 | 10-30 | 11-09 |
| IA7572 | SHEFFIELD 3 NW | -26 | 30 | {1951}-09-28 | 27 | {1949}-09-29 | 09-24 | 10-24 | 11-10 |
| IA7582 | SHELBY | -25 | 31 | {1991}-09-19 | 27 | {1984}-09-29 | 10-26 | 11-10 | 11-21 |
| IA7594 | Sheldon | -38 | 32 | {1974}-09-03 | 28 | {1902}-09-12 | 10-09 | 10-28 | 11-08 |
| IA7596 | SHELDON 1 N | -17 | 32 | {2007}-09-15 | 27 | {2003}-10-01 | 09-28 | 11-01 | 11-11 |
| IA7602 | SHELL ROCK 1 SW | -31 | 32 | {2007}-09-15 | 26 | {1974}-09-22 | 10-17 | 11-04 | 11-19 |
| IA7613 | SHENANDOAH-1-NE | -29 | 32 | {1937}-09-16 | 28 | {1918}-09-20 | 10-24 | 11-10 | 11-21 |
| IA7664 | SIBLEY-5-NNE | -40 | 30 | {1950}-08-20 | 23 | {1955}-09-11 | 10-07 | 10-28 | 11-06 |
| IA7669 | SIDNEY | -29 | 30 | {1901,1991}-09-18 | 28 | {1995}-09-22 | 10-25 | 11-11 | 11-22 |
| IA7678 | SIGOURNEY | -32 | 32 | {1902}-09-13 | 25 | {1913}-09-21 | 10-24 | 11-11 | 11-22 |
| IA7683 | SIGOURNEY 2 S | -20 | 32 | {2012}-09-23 | 25 | {2003}-10-02 | 10-27 | 11-12 | 11-21 |
| IA7700 | SIOUX CENTER 2 SE | -37 | 31 | {1974}-09-03 | 24 | {1991}-09-19 | 10-17 | 11-02 | 11-10 |
| IA7702 | SIOUX CITY ANG | -26 | 31 | {2012}-09-23 | 20 | {2004}-10-02 | 10-13 | 10-31 | 11-10 |
| IA7703 | SIOUX CITY 8 N | -26 | 32 | {1974}-09-22 | 28 | {1951}-09-28 | 10-19 | 11-04 | 11-12 |
| IA7708 | SIOUX-CITY-WSO-AP | -35 | 30 | {1902}-09-13 | 25 | {1995}-09-22 | 10-18 | 11-02 | 11-10 |
| IA7712 | SIOUX CITY | -35 | 30 | {1902}-09-13 | 25 | {1899}-09-29 | 10-20 | 11-08 | 11-11 |
| IA7713 | SIOUX CITY PERRY CREEK | -26 | 32 | {2011}-09-15 | 27 | {1984}-09-26 | 10-18 | 11-04 | 11-10 |
| IA7717 | SIOUX CITY HWY 77 BRG | -29 | 31 | {2020}-10-02 | 28 | {2019}-10-12 | 10-12 | 10-24 | 10-31 |
| IA7726 | SIOUX-RAPIDS | -32 | 31 | {1974}-09-03 | 28 | {1991}-09-19 | 10-09 | 11-02 | 11-09 |
| IA7738 | SLOAN | -24 | 30 | {1943}-09-20 | 28 | {1942}-09-24 | 10-09 | 10-26 | 11-09 |
| IA7774 | SOLDIER | -18 | 30 | {1951}-09-28 | 27 | {1948}-10-17 | 10-12 | 11-10 | 11-10 |
| IA7840 | SPENCER | -28 | 31 | {2007,2011}-09-15 | 27 | {2003}-10-01 | 10-12 | 10-27 | 11-11 |
| IA7844 | Spencer | -38 | 31 | {1974}-09-03 | 28 | {2007}-09-15 | 10-09 | 10-31 | 11-08 |
| IA7847 | SPENCER NO. 2 | -28 | 31 | {2011,2007}-09-15 | 27 | {2003}-10-01 | 10-15 | 11-02 | 11-07 |
| IA7855 | SPILLVILLE | -35 | 30 | {1991}-09-20 | 26 | {1974}-09-22 | 10-18 | 11-04 | 11-19 |
| IA7859 | SPIRIT LAKE | -39 | 31 | {1902}-09-12 | 28 | {1929}-09-18 | 10-17 | 11-02 | 11-10 |
| IA7887 | STACEYVILLE | -23 | 31 | {1941}-09-29 | 27 | {1941}-10-27 | 09-26 | 09-29 | 10-27 |
| IA7892 | STANLEY | -36 | 32 | {2025}-09-07 | 26 | {2012}-09-23 | 10-13 | 10-28 | 11-11 |
| IA7925 | STATE CENTER | -23 | 30 | {1942}-09-24 | 23 | {1942}-09-28 | 10-15 | 11-03 | 11-11 |
| IA7932 | STEAMBOAT ROCK | -28 | 32 | {2007}-09-15 | 28 | {1974}-09-22 | 10-18 | 11-07 | 11-12 |
| IA7955 | STOCKPORT | -35 | 32 | {1917}-09-11 | 27 | {1913}-09-22 | 10-21 | 11-11 | 11-22 |
| IA7979 | STORM-LAKE-2-E | -36 | 32 | {1902}-09-12 | 28 | {1929}-09-18 | 10-17 | 11-02 | 11-10 |
| IA7985 | STORY CITY | -25 | 32 | {2007}-09-15 | 25 | {2003}-10-02 | 10-15 | 11-07 | 11-12 |
| IA8009 | STRAWBERRY POINT | -31 | 32 | {2007}-09-15 | 28 | {1974}-09-22 | 10-18 | 11-07 | 11-20 |
| IA8021 | STUART | -30 | 32 | {1902}-09-13 | 24 | {1899}-09-29 | 10-12 | 11-08 | 11-11 |
| IA8026 | SWEA CITY 4 W | -32 | 32 | {1974}-09-03 | 26 | {1974}-09-22 | 10-10 | 11-01 | 11-10 |
| IA8062 | SWISHER #2 | -29 | 32 | {2012}-09-23 | 23 | {2003}-10-02 | 10-16 | 11-11 | 11-13 |
| IA8131 | TABOR 6 NNW | -16 | 30 | {1951}-09-28 | 28 | {1948}-10-17 | 10-22 | 11-10 | 11-13 |
| IA8147 | TARA | -31 | 23 | {1899}-09-29 | 23 | {1899}-09-29 | 09-29 | 10-06 | 10-31 |
| IA8169 | TERRIL | -24 | 28 | {1942}-09-24 | 28 | {1942}-09-24 | 09-20 | 10-16 | 10-26 |
| IA8231 | THURMAN | -37 | 32 | {1940}-09-11 | 28 | {1901}-09-18 | 10-21 | 11-08 | 11-15 |
| IA8255 | TINGLEY | -24 | 32 | {1927}-09-21 | 28 | {1942}-09-24 | 10-22 | 11-03 | 11-21 |
| IA8266 | TIPTON | -30 | 32 | {1902}-09-13 | 28 | {1991}-09-20 | 10-19 | 11-09 | 11-21 |
| IA8270 | TITONKA | -27 | 30 | {2007}-09-15 | 28 | {1984}-09-26 | 10-18 | 11-04 | 11-19 |
| IA8296 | TOLEDO | -34 | 31 | {1917}-09-11 | 27 | {1896}-09-20 | 10-17 | 11-06 | 11-12 |
| IA8307 | TRACY 1 NE | -29 | 32 | {1902}-09-13 | 24 | {1942}-09-28 | 10-25 | 11-11 | 11-22 |
| IA8315 | TRAER | -31 | 32 | {1991}-09-20 | 26 | {1967}-09-29 | 10-18 | 11-07 | 11-20 |
| IA8339 | TRIPOLI-4-N | -32 | 31 | {2007}-09-15 | 27 | {1974}-09-22 | 10-16 | 11-04 | 11-11 |
| IA8341 | TRIPOLI 2N | -31 | 31 | {2007}-09-15 | 21 | {2003}-10-02 | 10-13 | 11-01 | 11-12 |
| IA8359 | TURIN 4S | -23 | 31 | {1991}-09-19 | 27 | {1984}-09-29 | 10-19 | 11-10 | 11-20 |
| IA8360 | TURIN 4 SSW | -23 | 32 | {1993}-09-15 | 28 | {1991}-09-19 | 10-19 | 11-10 | 11-20 |
| IA8410 | UNDERWOOD | -27 | 32 | {2012}-09-23 | 28 | {2004}-10-02 | 10-13 | 10-31 | 11-11 |
| IA8538 | VILLISCA | -27 | 30 | {1901}-09-18 | 27 | {1896}-09-28 | 10-17 | 11-03 | 11-05 |
| IA8540 | VILLISCA NO. 2 | -19 | 31 | {2003}-09-29 | 28 | {2004}-10-02 | 10-24 | 11-11 | 11-20 |
| IA8568 | VINTON | -35 | 32 | {1953,1902}-09-13 | 28 | {1982}-09-21 | 10-18 | 11-08 | 11-21 |
| IA8632 | WALFORD 2 SE | -30 | 31 | {1929}-09-18 | 28 | {1926}-09-26 | 10-24 | 11-10 | 11-22 |
| IA8646 | STANTON 4N | -16 | 27 | {1948}-10-17 | 27 | {1948}-10-17 | 10-22 | 11-10 | 11-20 |
| IA8658 | WAUKEE 3NE | -30 | 31 | {2012}-09-23 | 27 | {2012}-10-06 | 10-17 | 11-11 | 11-11 |
| IA8668 | Wapello | -27 | 31 | {1991}-09-20 | 28 | {1984}-09-29 | 10-25 | 11-12 | 11-22 |
| IA8688 | WASHINGTON | -32 | 30 | {1902}-09-13 | 28 | {1983}-09-23 | 10-25 | 11-11 | 11-22 |
| IA8693 | WASHTA | -47 | 27 | {1973}-08-22 | 27 | {1973}-08-22 | 10-17 | 11-02 | 11-10 |
| IA8704 | WATERLOO | -33 | 32 | {1917}-09-11 | 28 | {1929}-09-18 | 10-13 | 11-03 | 11-12 |
| IA8705 | WATERLOO #1 | -20 | 32 | {2007}-09-15 | 22 | {2003}-10-02 | 10-14 | 11-03 | 11-20 |
| IA8706 | WATERLOO | -34 | 32 | {1917}-09-11 | 28 | {1929}-09-18 | 10-17 | 11-03 | 11-11 |
| IA8707 | WATERLOO SNOW | -24 | 30 | {2012}-09-23 | 28 | {2012}-10-06 | 10-14 | 11-07 | 11-11 |
| IA8742 | WAUCOMA 1WNW | -32 | 32 | {2011,2007}-09-15 | 26 | {1974}-09-22 | 10-16 | 11-07 | 11-12 |
| IA8747 | WAUKEE | -36 | 32 | {1902}-09-13 | 28 | {1918}-09-20 | 10-21 | 11-08 | 11-21 |
| IA8755 | WAUKON | -34 | 32 | {1937,2011}-09-16 | 25 | {1942}-09-25 | 10-16 | 11-03 | 11-11 |
| IA8756 | WAUKON 4SW | -43 | 29 | {2018}-09-29 | 25 | {2018}-10-12 | 09-29 | 10-12 | 10-12 |
| IA8771 | WAVERLY | -34 | 32 | {1915}-08-30 | 28 | {1918}-09-21 | 10-13 | 11-02 | 11-11 |
| IA8806 | WEBSTER-CITY | -36 | 30 | {1955}-09-11 | 25 | {1929}-09-18 | 10-17 | 11-02 | 11-11 |
| IA8843 | WESCOTT | -22 | 31 | {1926}-09-26 | 25 | {1925}-10-10 | 10-19 | 11-08 | 11-08 |
| IA8852 | WEST BEND | -36 | 30 | {1908}-09-01 | 26 | {1929}-09-18 | 10-12 | 10-27 | 11-08 |
| IA8856 | WEST BRANCH | -23 | 32 | {1902}-09-13 | 24 | {1899}-09-28 | 10-17 | 11-02 | 11-15 |
| IA8860 | WEST DES MOINES 6 W | -21 | 31 | {2012}-09-23 | 27 | {2012}-10-06 | 10-21 | 11-11 | 11-23 |
| IA8867 | WEST UNION 3SE | -27 | 32 | {2007}-09-15 | 22 | {2003}-10-02 | 10-15 | 11-01 | 11-23 |
| IA8870 | WEST UNION 5 NW | -24 | 30 | {2001,2000}-10-06 | 27 | {2000}-10-07 | 09-24 | 10-07 | 11-17 |
| IA8880 | WEST UNION | -30 | 32 | {1902}-09-13 | 20 | {1899}-09-30 | 09-18 | 11-03 | 11-05 |
| IA8974 | WEVER | -21 | 30 | {1928}-09-26 | 21 | {1930}-10-20 | 10-21 | 11-04 | 11-06 |
| IA8985 | WHAT CHEER | -31 | 32 | {1902}-09-13 | 27 | {1899}-09-29 | 10-14 | 11-06 | 11-14 |
| IA8989 | WHEATLAND | -18 | 32 | {1949}-09-29 | 26 | {1948}-10-17 | 10-24 | 11-10 | 11-20 |
| IA9000 | WHITTEN | -35 | 31 | {1902}-09-12 | 25 | {1913}-09-22 | 10-19 | 10-28 | 11-11 |
| IA9062 | WILLIAMS | -25 | 32 | {1991}-09-20 | 28 | {1984}-09-29 | 10-18 | 11-06 | 11-11 |
| IA9067 | WILLIAMSBURG | -31 | 32 | {1917}-09-11 | 28 | {1991}-09-20 | 10-19 | 11-08 | 11-21 |
| IA9095 | WILTON JUNCTION | -33 | 32 | {1904}-09-12 | 18 | {1899}-09-30 | 10-12 | 11-11 | 11-12 |
| IA9132 | WINTERSET | -35 | 31 | {1955}-09-12 | 26 | {1896}-09-20 | 10-24 | 11-08 | 11-21 |
| IA9164 | WOODBINE | -22 | 32 | {1943}-09-20 | 28 | {1942}-09-24 | 10-22 | 11-03 | 11-10 |
| IA9168 | WOODBURN | -33 | 30 | {1910}-09-10 | 27 | {1908}-09-28 | 10-12 | 10-28 | 11-12 |
| IA9178 | WOODWARD 7 N | -27 | 32 | {1962}-09-20 | 27 | {1966}-10-01 | 10-24 | 11-06 | 11-21 |
| IA9750 | ZEARING | -35 | 32 | {2007}-09-15 | 28 | {1907}-09-25 | 10-19 | 11-08 | 11-20 |
| IAC001 | Iowa - Northwest Climate Division | -38 | 30 | {1902}-09-12 | 26 | {1918}-09-20 | 10-16 | 11-02 | 11-10 |
| IAC002 | Iowa - North Central Climate Division | -38 | 32 | {1902}-09-13 | 28 | {1929}-09-18 | 10-17 | 11-02 | 11-11 |
| IAC003 | Iowa - Northeast Climate Division | -35 | 32 | {1902}-09-13 | 26 | {1926}-09-26 | 10-17 | 11-03 | 11-11 |
| IAC004 | Iowa - West Central Climate Division | -35 | 31 | {1902}-09-12 | 28 | {1918}-09-20 | 10-19 | 11-05 | 11-11 |
| IAC005 | Iowa - Central Climate Division | -34 | 31 | {1929}-09-18 | 28 | {1913}-09-22 | 10-19 | 11-08 | 11-13 |
| IAC006 | Iowa - East Central Climate Division | -31 | 32 | {1929}-09-18 | 28 | {1926}-09-26 | 10-20 | 11-09 | 11-21 |
| IAC007 | Iowa - Southwest Climate Division | -30 | 32 | {1902}-09-13 | 26 | {1942}-09-28 | 10-24 | 11-10 | 11-21 |
| IAC008 | Iowa - South Central Climate Division | -30 | 31 | {1991}-09-19 | 25 | {1942}-09-28 | 10-25 | 11-11 | 11-21 |
| IAC009 | Iowa - Southeast Climate Division | -29 | 32 | {1896,1991}-09-20 | 25 | {1942}-09-28 | 10-25 | 11-11 | 11-22 |
| IAD001 | Iowa Drought Region 1 - Northwest | -38 | 30 | {1902}-09-12 | 28 | {1991}-09-19 | 10-17 | 11-02 | 11-10 |
| IAD002 | Iowa Drought Region 2 - Northcentral | -34 | 32 | {1902}-09-12 | 27 | {1913}-09-22 | 10-17 | 11-03 | 11-11 |
| IAD003 | Iowa Drought Region 3 - Northeast | -32 | 32 | {1902}-09-13 | 27 | {1926}-09-26 | 10-18 | 11-06 | 11-12 |
| IAD004 | Iowa Drought Region 4 - Southwest | -31 | 32 | {1902}-09-12 | 26 | {1942}-09-28 | 10-21 | 11-08 | 11-21 |
| IAD005 | Iowa Drought Region 5 - Southeast | -30 | 31 | {1991}-09-20 | 24 | {1942}-09-28 | 10-25 | 11-11 | 11-22 |
| IAKSPW | Spencer Airport | -37 | -1 | {2010}-08-16 | -1 | {2010}-08-16 | 10-10 | 10-27 | 11-10 |
| IATALO | Waterloo Area | -34 | 32 | {1917}-09-11 | 28 | {1929}-09-18 | 10-17 | 11-03 | 11-12 |
| IATAME | Ames Area | -37 | 31 | {1902}-09-13 | 26 | {1918}-09-21 | 10-18 | 11-06 | 11-12 |
| IATCID | Cedar Rapids Area | -30 | 31 | {2007}-09-15 | 28 | {2012}-09-24 | 10-19 | 11-09 | 11-21 |
| IATDBQ | Dubuque Area | -31 | 32 | {2007}-09-15 | 28 | {1956}-09-20 | 10-22 | 11-10 | 11-21 |
| IATDSM | Des Moines Area | -29 | 31 | {1995}-09-22 | 26 | {1942}-09-28 | 10-24 | 11-11 | 11-21 |
| IATIDA | Ida Grove Area | -36 | 32 | {1974}-09-03 | 27 | {1918}-09-20 | 10-17 | 11-02 | 11-10 |
| IATMCW | Mason City Area | -35 | 30 | {1915}-08-30 | 28 | {1923}-09-14 | 10-10 | 11-01 | 11-09 |
| IATOEL | Oelwein Area | -33 | 28 | {1955}-09-11 | 28 | {1955}-09-11 | 10-16 | 11-06 | 11-12 |
| IATSPW | Spencer Area | -38 | -1 | {2010}-08-16 | -1 | {2010}-08-16 | 10-09 | 10-31 | 11-08 |
| IATSUX | Sioux City Area | -35 | 30 | {1902}-09-13 | 25 | {1995}-09-22 | 10-18 | 11-02 | 11-10 |