603
CDUS45 KRIW 180045
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
545 PM MST WED DEC 17 2025
...............................
..THE CASPER WY CLIMATE SUMMARY FOR DECEMBER 17 2025
VALID TODAY AS OF 0500 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 54 1:14 PM 60 1980 34 20 38
MINIMUM 40 1:30 AM -31 1964 14 26 18
AVERAGE 47 24 23 28
PRECIPITATION (IN)
TODAY T 0.45 1970 0.02 -0.02 0.00
MONTH TO DATE 0.11 0.34 -0.23 0.01
SINCE DEC 1 0.11 0.34 -0.23 0.01
SINCE JAN 1 11.80 11.95 -0.15 9.13
SNOWFALL (IN)
TODAY MM 0.3 MM 0.0
MONTH TO DATE 1.0 6.0 -5.0 T
SINCE DEC 1 1.0 6.0 -5.0 T
SINCE JUL 1 5.3 23.4 -18.1 T
SNOW DEPTH MM
DEGREE DAYS
HEATING
TODAY 18 41 -23 37
MONTH TO DATE 473 672 -199 540
SINCE DEC 1 473 672 -199 540
SINCE JUL 1 1899 2474 -575 2040
COOLING
TODAY 0 0 0 0
MONTH TO DATE 0 0 0 0
SINCE DEC 1 0 0 0 0
SINCE JAN 1 467 443 24 538
...............................................................
WIND (MPH)
HIGHEST WIND SPEED 51 HIGHEST WIND DIRECTION SW (220)
HIGHEST GUST SPEED 72 HIGHEST GUST DIRECTION SW (240)
AVERAGE WIND SPEED 28.0
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.2
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
THUNDERSTORM
LIGHT RAIN
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 74
LOWEST 33
AVERAGE 54
......................................................
THE CASPER WY CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 34 52 1994
MINIMUM TEMPERATURE (F) 14 -18 1983
SUNRISE AND SUNSET
DECEMBER 17 2025......SUNRISE 7:31 AM MST SUNSET 4:33 PM MST
DECEMBER 18 2025......SUNRISE 7:32 AM MST SUNSET 4:33 PM MST
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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