290
CDUS45 KRIW 220045
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
645 PM MDT SUN SEP 21 2025
...............................
..THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 21 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 80 3:24 PM 85 1966 73 7 63
MINIMUM 54 1:18 AM 21 1983 40 14 37
AVERAGE 67 57 10 50
PRECIPITATION (IN)
TODAY 0.00 1.09 1962 0.04 -0.04 0.00
MONTH TO DATE 2.11 0.59 1.52 0.24
SINCE SEP 1 2.11 0.59 1.52 0.24
SINCE JAN 1 9.42 9.42 0.00 7.22
SNOWFALL (IN)
TODAY MM 0.1 MM 0.0
MONTH TO DATE 0.0 0.7 -0.7 0.0
SINCE SEP 1 0.0 0.7 -0.7 0.0
SINCE JUL 1 0.0 0.7 -0.7 0.0
SNOW DEPTH MM
DEGREE DAYS
HEATING
TODAY 0 9 -9 15
MONTH TO DATE 74 114 -40 61
SINCE SEP 1 74 114 -40 61
SINCE JUL 1 84 159 -75 99
COOLING
TODAY 2 0 2 0
MONTH TO DATE 17 29 -12 51
SINCE SEP 1 17 29 -12 51
SINCE JAN 1 467 441 26 526
...............................................................
WIND (MPH)
HIGHEST WIND SPEED 24 HIGHEST WIND DIRECTION SW (210)
HIGHEST GUST SPEED 29 HIGHEST GUST DIRECTION SW (220)
AVERAGE WIND SPEED 12.9
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.1
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
THUNDERSTORM
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 60
LOWEST 23
AVERAGE 42
......................................................
THE CASPER WY CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 72 87 1966
1992
2007
MINIMUM TEMPERATURE (F) 40 25 2000
SUNRISE AND SUNSET
SEPTEMBER 21 2025.....SUNRISE 6:52 AM MDT SUNSET 7:04 PM MDT
SEPTEMBER 22 2025.....SUNRISE 6:54 AM MDT SUNSET 7:02 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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