645
CDUS45 KRIW 190045
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
545 PM MST THU DEC 18 2025
...............................
..THE CASPER WY CLIMATE SUMMARY FOR DECEMBER 18 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 38 2:52 PM 52 1994 34 4 46
MINIMUM 18 5:53 AM -18 1983 14 4 20
AVERAGE 28 24 4 33
PRECIPITATION (IN)
TODAY T 0.19 1961 0.01 -0.01 0.00
MONTH TO DATE 0.11 0.35 -0.24 0.01
SINCE DEC 1 0.11 0.35 -0.24 0.01
SINCE JAN 1 11.80 11.96 -0.16 9.13
SNOWFALL (IN)
TODAY MM 0.4 MM 0.0
MONTH TO DATE 1.0 6.4 -5.4 T
SINCE DEC 1 1.0 6.4 -5.4 T
SINCE JUL 1 5.3 23.8 -18.5 T
SNOW DEPTH MM
DEGREE DAYS
HEATING
TODAY 37 41 -4 32
MONTH TO DATE 515 713 -198 572
SINCE DEC 1 515 713 -198 572
SINCE JUL 1 1941 2515 -574 2072
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 31 HIGHEST WIND DIRECTION SW (220)
HIGHEST GUST SPEED 39 HIGHEST GUST DIRECTION SW (220)
AVERAGE WIND SPEED 16.7
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.1
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
LIGHT SNOW
RELATIVE HUMIDITY (PERCENT)
HIGHEST 53
LOWEST 23
AVERAGE 38
......................................................
THE CASPER WY CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 34 55 2023
MINIMUM TEMPERATURE (F) 14 -24 1990
SUNRISE AND SUNSET
DECEMBER 18 2025......SUNRISE 7:32 AM MST SUNSET 4:33 PM MST
DECEMBER 19 2025......SUNRISE 7:33 AM MST SUNSET 4:34 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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