Freezing Dates

Using the NWS COOP data archive, significant dates relating to fall are extracted and presented on this page. The specific dates are the first occurance of that temperature and may have occured again in subsequent years.
The "Record Lows" columns show the first fall occurance of a low temperature. The "Average Lows" column shows when certain climatological thresholds are surpassed in the fall.

Select Network:
COOP Site: Record Lows: Average Lows:
Temp <= 32°F Temp <= 28°F Below 40°F Below 32°F Below 28°F
Temp: Date: Temp: Date:
HOLSTEIN 5 NNW 30 {2020}-10-02 28 {2019}-10-12 10-08 10-15 10-27
BATTLE CREEK 3NE 32 {2014}-09-13 24 {2012}-09-23 10-04 10-17 10-31
ROCK-RAPIDS 31 {1974}-09-03 26 {1894}-09-10 10-07 10-24 11-05
LITTLE SIOUX 2NW 31 {2007}-09-15 27 {2012}-09-23 10-08 10-25 11-01
Spencer Airport -1 {2010}-08-16 -1 {2010}-08-16 10-09 10-26 11-10
SIBLEY-5-NNE 30 {1950}-08-20 23 {1955}-09-11 10-07 10-26 11-03
ESTHERVILLE MUNICIPAL AP 31 {2014}-09-13 28 {2007}-09-15 10-10 10-26 11-07
Spencer Area -1 {2010}-08-16 -1 {2010}-08-16 10-09 10-27 11-08
SANBORN 32 {1974}-09-03 25 {1929}-09-18 10-10 10-27 11-07
CHEROKEE 31 {1974}-09-03 27 {1955}-09-11 10-07 10-27 11-07
Spencer 31 {1974}-09-03 28 {2007}-09-15 10-09 10-27 11-08
SIOUX-RAPIDS 31 {1974}-09-03 28 {1991}-09-19 10-09 10-27 11-07
Estherville 4E 32 {1924}-09-09 27 {1929}-09-18 10-07 10-27 11-06
STANLEY 31 {2014}-09-13 26 {2012}-09-23 10-11 10-27 11-01
SIOUX CITY ANG 31 {2012}-09-23 20 {2004}-10-02 10-11 10-27 11-10
Elkader 6SSW (Osborn) 32 {1893}-08-29 0 {2002}-09-02 10-09 10-28 11-10
MASON-CITY 30 {1915}-08-30 28 {1923}-09-14 10-10 10-28 11-09
FAYETTE 32 {1949}-09-01 27 {1902}-09-12 10-10 10-28 11-10
FOREST-CITY 31 {1949}-09-01 27 {1929}-09-18 10-13 10-28 11-10
POCAHONTAS 31 {1946}-09-02 27 {1929}-09-18 10-10 10-28 11-10
CARROLL-2-SSW 28 {1974}-09-03 28 {1974}-09-03 10-16 10-28 11-10
Ida Grove Area 32 {1974}-09-03 27 {1918}-09-20 10-16 10-28 11-10
SIOUX CENTER 2 SE 31 {1974}-09-03 24 {1991}-09-19 10-16 10-28 11-10
WEBSTER-CITY 30 {1955}-09-11 25 {1929}-09-18 10-12 10-28 11-10
MASON CITY MUNICIPAL AP 31 {2014}-09-13 26 {2011}-09-15 10-09 10-28 11-07
NORTHWOOD 32 {1953}-09-13 28 {1929}-09-18 10-10 10-28 11-08
OELWEIN 1E 32 {2011}-09-15 28 {2012}-10-05 10-13 10-28 11-11
SWEA CITY 4 W 32 {1974}-09-03 26 {1974}-09-22 10-09 10-29 11-10
Le Mars 31 {1955}-09-11 28 {1902}-09-12 10-12 10-29 11-08
DAVENPORT WFO 30 {2012}-09-23 27 {2012}-10-05 10-15 10-29 11-11
ANAMOSA 3 SSW 30 {2012}-09-24 26 {2015}-10-17 10-15 10-29 11-12
Milford 32 {1974}-09-03 28 {1929}-09-18 10-10 10-31 11-08
PRIMGHAR 30 {1902}-09-12 25 {1901}-09-18 10-16 10-31 11-10
Iowa - Northwest Climate Division 30 {1902}-09-12 26 {1918}-09-20 10-13 10-31 11-10
AMES MUNICIPAL AP 31 {2007}-09-15 27 {2003}-09-30 10-14 10-31 11-11
MARSHALLTOWN MUNICIPAL AP 30 {2007}-09-15 27 {2012}-09-23 10-14 10-31 11-11
IOWA-FALLS 31 {1915}-08-30 28 {1894}-09-18 10-12 11-01 11-10
DECORAH-2-N 32 {1915}-08-30 28 {1946}-09-02 10-10 11-01 11-11
NEW-HAMPTON 28 {1949}-09-01 28 {1949}-09-01 10-13 11-01 11-10
ATLANTIC-1-NE 30 {1893}-09-02 28 {1902,1955}-09-12 10-16 11-01 11-10
ALGONA 29 {1893}-09-02 27 {1929}-09-18 10-17 11-01 11-10
SAC-CITY 32 {1974}-09-03 28 {1918}-09-20 10-16 11-01 11-11
Emmetsburg 0 {2005}-09-03 0 {2005}-09-03 10-13 11-01 11-10
HAMPTON-2-NW 32 {1955}-09-11 28 {1955}-09-12 10-12 11-01 11-10
SPIRIT LAKE 31 {1902}-09-12 28 {1929}-09-18 10-17 11-01 11-10
Iowa Drought Region 1 - Northwest 30 {1902}-09-12 25 {1918}-09-20 10-17 11-01 11-10
AUDUBON 30 {1902,1955}-09-12 27 {1896}-09-19 10-17 11-01 11-10
STORM-LAKE-2-E 32 {1902}-09-12 28 {1929}-09-18 10-17 11-01 11-10
LOWDEN 32 {2014}-09-13 26 {2012}-09-24 10-14 11-01 11-11
OSAGE 30 {1949}-09-14 28 {1929}-09-18 10-13 11-01 11-10
JEFFERSON 32 {1893}-08-29 28 {1929}-09-18 10-17 11-02 11-11
ALLISON 32 {1915}-08-30 28 {1926}-09-25 10-17 11-02 11-11
Postville 32 {1919}-09-02 20 {1918}-09-21 10-17 11-02 11-11
FORT-DODGE 32 {1974}-09-03 27 {1902}-09-13 10-16 11-02 11-11
GRINNELL-3-SW 31 {1976}-09-10 27 {1991}-09-20 10-17 11-02 11-11
Oelwein Area 28 {1955}-09-11 28 {1955}-09-11 10-10 11-02 11-11
Waterloo Area 32 {1917}-09-11 28 {1929}-09-18 10-13 11-02 11-11
MAPLETON NO. 2 31 {1955}-09-11 27 {1991}-09-19 10-15 11-02 11-10
MAQUOKETA-2-W 31 {1917}-09-11 28 {1983}-09-23 10-17 11-02 11-12
WATERLOO 32 {1917}-09-11 28 {1929}-09-18 10-13 11-02 11-10
TOLEDO 31 {1917}-09-11 27 {1896}-09-20 10-17 11-02 11-11
CHARLES-CITY 32 {1902,1955}-09-12 28 {1991}-09-20 10-16 11-02 11-11
LOGAN 30 {1902}-09-12 28 {1902}-09-13 10-17 11-02 11-11
GUTHRIE-CENTER 31 {1902}-09-12 28 {1991}-09-19 10-17 11-02 11-11
Iowa Drought Region 2 - Northcentral 32 {1902}-09-12 27 {1913}-09-22 10-17 11-02 11-11
Boone 32 {1975}-09-12 27 {1929}-09-18 10-17 11-02 11-11
GRUNDY-CENTER 32 {1902}-09-12 28 {1929}-09-18 10-13 11-02 11-11
DENISON 29 {1902}-09-12 21 {1918}-09-21 10-18 11-02 11-11
Iowa - West Central Climate Division 31 {1902}-09-12 28 {1918}-09-20 10-17 11-02 11-11
PERRY 32 {1955}-09-12 27 {1929}-09-18 10-17 11-02 11-11
MARSHALLTOWN 31 {1955}-09-12 28 {1896}-09-20 10-13 11-02 11-11
CLARINDA 31 {1902}-09-13 28 {1918}-09-21 10-18 11-02 11-19
MANCHESTER-2 32 {2014}-09-13 27 {1984}-09-16 10-13 11-02 11-11
Ames Area 31 {1902}-09-13 26 {1918}-09-21 10-17 11-02 11-11
Iowa - North Central Climate Division 32 {1902,2014}-09-13 28 {1929}-09-18 10-17 11-02 11-10
Sioux City Area 30 {1902}-09-13 25 {1995}-09-22 10-17 11-02 11-10
SIOUX-CITY-WSO-AP 30 {1902}-09-13 25 {1995}-09-22 10-17 11-02 11-10
Iowa - Northeast Climate Division 32 {1902}-09-13 26 {1926}-09-26 10-17 11-02 11-11
AMES-8-WSW 31 {1902}-09-13 26 {1918}-09-21 10-18 11-02 11-12
WAUKON 32 {1937,2011}-09-16 25 {1942}-09-25 10-13 11-02 11-10
CASCADE 32 {2023}-08-31 28 {1953,1974}-09-22 10-10 11-03 11-11
OAKLAND-2-E 32 {1974}-09-03 28 {1995}-09-22 10-17 11-03 11-11
BELLE-PLAINE 31 {1917}-09-11 28 {1916,1929}-09-18 10-17 11-03 11-12
RED-OAK 32 {1940}-09-11 28 {1995}-09-22 10-19 11-03 11-21
WILLIAMSBURG 32 {1917}-09-11 28 {1991}-09-20 10-18 11-03 11-12
CORNING 32 {1902}-09-12 27 {1983}-09-21 10-17 11-03 11-13
Iowa Average 32 {1902}-09-13 24 {1942}-09-28 10-19 11-03 11-11
VINTON 32 {1902,1953}-09-13 28 {1982}-09-21 10-17 11-03 11-12
Iowa Drought Region 3 - Northeast 32 {1902}-09-13 27 {1926}-09-26 10-19 11-03 11-12
Dubuque Airport 32 {2007}-09-15 28 {1956}-09-20 10-16 11-03 11-13
Creston 31 {1924}-09-15 28 {1991}-09-19 10-18 11-03 11-13
Cedar Rapids Area 31 {2007}-09-15 28 {2012}-09-24 10-18 11-03 11-19
Iowa - Central Climate Division 31 {1929}-09-18 28 {1913}-09-22 10-19 11-03 11-11
AMES 5 SE 32 {1902}-09-13 28 {1926}-09-26 10-19 11-04 11-20
Iowa Drought Region 4 - Southwest 32 {1902}-09-12 26 {1942}-09-28 10-19 11-05 11-19
CHARITON 32 {1955}-09-12 28 {1918,1991}-09-20 10-17 11-05 11-21
MOUNT-AYR 32 {1902}-09-13 28 {1991}-09-19 10-19 11-05 11-19
Dubuque Area 32 {2007}-09-15 28 {1956}-09-20 10-19 11-05 11-21
Cedar Rapids Airport 31 {2007}-09-15 28 {2012}-09-24 10-17 11-05 11-13
BEACONSFIELD 27 {1991}-09-19 27 {1991}-09-19 10-19 11-05 11-20
BELLEVUE-L-AND-D-12 32 {1986}-08-30 28 {1974,1995}-09-23 10-17 11-06 11-21
Iowa City 32 {1923}-09-14 28 {1916}-09-18 10-19 11-06 11-21
CEDAR-RAPIDS-1 32 {2007}-09-15 24 {1926}-09-26 10-20 11-06 11-21
Iowa - East Central Climate Division 32 {1929}-09-18 28 {1926}-09-26 10-20 11-06 11-21
NEWTON 32 {1929}-09-18 23 {1942}-09-28 10-20 11-06 11-21
RATHBUN DAM 0 {2012}-08-09 0 {2012}-08-09 10-17 11-07 11-21
WINTERSET 31 {1955}-09-12 26 {1896}-09-20 10-19 11-07 11-21
OSCEOLA-3-WSW 31 {2007}-09-15 28 {1974}-09-22 10-19 11-07 11-21
SHENANDOAH-1-NE 32 {1937}-09-16 28 {1918}-09-20 10-19 11-07 11-21
GUTTENBERG-L-AND-D-10 32 {1973}-09-18 25 {1942}-09-28 10-24 11-07 11-21
IOWA CITY MUNICIPAL AP 32 {1991}-09-20 26 {1995}-09-23 10-19 11-07 11-21
FAIRFIELD 32 {1917}-09-11 28 {1918}-09-21 10-24 11-08 11-22
COLUMBUS JUNCT 2 SSW 31 {1955}-09-12 28 {1991}-09-20 10-24 11-08 11-22
Iowa - Southwest Climate Division 32 {1902}-09-13 26 {1942}-09-28 10-24 11-08 11-21
SIGOURNEY 32 {1902}-09-13 25 {1913}-09-21 10-19 11-08 11-22
WASHINGTON 30 {1902}-09-13 28 {1983}-09-23 10-24 11-08 11-21
OSKALOOSA 31 {1902}-09-13 27 {1991}-09-20 10-19 11-08 11-21
GREENFIELD 32 {1981}-09-17 27 {1913}-09-22 10-19 11-08 11-21
Lamoni 32 {1901}-09-18 27 {1942}-09-28 10-24 11-08 11-21
Allerton 31 {1991}-09-19 27 {1913}-09-22 10-19 11-08 11-21
Iowa - South Central Climate Division 32 {1918}-09-21 25 {1942}-09-28 10-25 11-08 11-21
Iowa Drought Region 5 - Southeast 32 {1918}-09-21 24 {1942}-09-28 10-25 11-08 11-21
Des Moines Airport 31 {1995}-09-22 26 {1942}-09-28 10-24 11-08 11-21
Des Moines Area 31 {1995}-09-22 26 {1942}-09-28 10-24 11-08 11-21
CLINTON-1 31 {1902}-09-13 28 {1928}-09-25 10-20 11-09 11-22
Ottumwa 32 {2007}-09-15 23 {1942}-09-28 10-24 11-09 11-22
Iowa - Southeast Climate Division 32 {1896}-09-20 25 {1942}-09-28 10-25 11-09 11-22
KEOSAUQUA 31 {1917}-09-11 28 {1916}-09-18 10-24 11-10 11-22
CENTERVILLE 31 {1913}-09-13 28 {1913}-09-22 10-25 11-10 11-22
MOUNT-PLEASANT 32 {1902}-09-13 28 {1942}-09-24 10-25 11-10 11-22
Burlington Airport 30 {1918}-09-18 25 {1942}-09-28 10-27 11-10 11-24
DUBUQUE-LOCK-AND-DAM 31 {1956}-09-20 24 {1899}-09-30 10-25 11-10 11-22
Donnellson 31 {1991}-09-20 25 {1942}-09-28 10-19 11-10 11-22
MUSCATINE 29 {1991}-09-20 23 {1942}-09-28 10-25 11-10 11-21
DES MOINES WSFO-JOHNSTON 31 {1999}-09-21 28 {2004}-10-02 10-21 11-10 11-12
LAMONI -1 {2011,2012}-08-07 -1 {2011,2012}-08-07 10-26 11-11 11-21
Fort Madison 32 {1913}-09-22 26 {1942}-09-28 10-27 11-11 11-24
Le Claire L&D 14 32 {1942}-09-26 28 {1942}-09-28 10-28 11-11 11-23
BURLINGTON 32 {1984}-09-26 28 {1974}-10-02 10-28 11-11 11-27
MUSCATINE 2N 27 {2003}-10-02 27 {2003}-10-02 10-17 11-11 11-22
KEOKUK LOCK DAM 19 30 {1992}-09-23 23 {1952}-10-06 11-02 11-13 11-28