579 CDUS45 KRIW 180730 CLICPR CLIMATE REPORT NATIONAL WEATHER SERVICE RIVERTON WY 130 AM MDT THU SEP 18 2025 ................................... ...THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 17 2025... CLIMATE NORMAL PERIOD: 1991 TO 2020 CLIMATE RECORD PERIOD: 1939 TO 2025 WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST VALUE (LST) VALUE VALUE FROM YEAR NORMAL ................................................................... TEMPERATURE (F) YESTERDAY MAXIMUM 62 4:53 PM 89 2000 75 -13 76 MINIMUM 49 7:15 AM 19 1965 42 7 45 AVERAGE 56 58 -2 PRECIPITATION (IN) YESTERDAY 0.82R 0.75 2003 0.03 0.79 0.07 MONTH TO DATE 2.11 0.45 1.66 0.24 SINCE SEP 1 2.11 0.45 1.66 0.24 SINCE JAN 1 9.42 9.28 0.14 7.22 SNOWFALL (IN) YESTERDAY 0.0 4.4 1965 0.0 0.0 0.0 MONTH TO DATE 0.0 0.4 -0.4 0.0 SINCE SEP 1 0.0 0.4 -0.4 0.0 SINCE JUL 1 0.0 0.4 -0.4 0.0 SNOW DEPTH 0 DEGREE DAYS HEATING YESTERDAY 9 7 2 4 MONTH TO DATE 58 81 -23 29 SINCE SEP 1 58 81 -23 29 SINCE JUL 1 68 126 -58 67 COOLING YESTERDAY 0 1 -1 0 MONTH TO DATE 15 27 -12 51 SINCE SEP 1 15 27 -12 51 SINCE JAN 1 465 439 26 526 ................................................................... WIND (MPH) HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION N (360) HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION N (360) AVERAGE WIND SPEED 7.2 SKY COVER POSSIBLE SUNSHINE MM AVERAGE SKY COVER 1.0 WEATHER CONDITIONS THE FOLLOWING WEATHER WAS RECORDED YESTERDAY. HEAVY RAIN RAIN LIGHT RAIN FOG RELATIVE HUMIDITY (PERCENT) HIGHEST 100 2:00 AM LOWEST 56 5:00 PM AVERAGE 78 .......................................................... THE CASPER WY CLIMATE NORMALS FOR TODAY NORMAL RECORD YEAR MAXIMUM TEMPERATURE (F) 75 92 2014 MINIMUM TEMPERATURE (F) 42 19 1965 SUNRISE AND SUNSET SEPTEMBER 18 2025.....SUNRISE 6:49 AM MDT SUNSET 7:10 PM MDT SEPTEMBER 19 2025.....SUNRISE 6:50 AM MDT SUNSET 7:08 PM MDT - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. $$