839
CDUS45 KRIW 180045
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
645 PM MDT WED SEP 17 2025
...............................
..THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 17 2025
VALID TODAY AS OF 0600 PM LOCAL TIME.
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)
TODAY
MAXIMUM 62 4:53 PM 89 2000 75 -13 76
MINIMUM 49 7:15 AM 19 1965 42 7 45
AVERAGE 56 58 -2 61
PRECIPITATION (IN)
TODAY 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)
TODAY MM 0.0 MM 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 MM
DEGREE DAYS
HEATING
TODAY 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
TODAY 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 14 HIGHEST WIND DIRECTION NW (320)
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION NW (320)
AVERAGE WIND SPEED 8.4
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 1.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
HEAVY RAIN
RAIN
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100
LOWEST 56
AVERAGE 78
......................................................
THE CASPER WY CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 75 92 2014
MINIMUM TEMPERATURE (F) 42 19 1965
SUNRISE AND SUNSET
SEPTEMBER 17 2025.....SUNRISE 6:48 AM MDT SUNSET 7:11 PM MDT
SEPTEMBER 18 2025.....SUNRISE 6:49 AM MDT SUNSET 7:10 PM MDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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