Climatological Report (Daily)
Issued by NWS
Issued by NWS
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CDUS45 KRIW 300733
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
133 AM MDT TUE SEP 30 2025
...................................
...THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 29 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 76 3:43 PM 91 2024 68 8 91
MINIMUM 51 10:11 PM 18 1984 37 14 50
AVERAGE 64 53 11
PRECIPITATION (IN)
YESTERDAY 0.00 0.50 1995 0.04 -0.04 0.00
2021
MONTH TO DATE 2.55 0.91 1.64 0.24
SINCE SEP 1 2.55 0.91 1.64 0.24
SINCE JAN 1 9.86 9.74 0.12 7.22
SNOWFALL (IN)
YESTERDAY 0.0 2.7 1961 0.1 -0.1 0.0
MONTH TO DATE 0.0 1.4 -1.4 0.0
SINCE SEP 1 0.0 1.4 -1.4 0.0
SINCE JUL 1 0.0 1.4 -1.4 0.0
SNOW DEPTH 0
DEGREE DAYS
HEATING
YESTERDAY 1 12 -11 0
MONTH TO DATE 112 200 -88 86
SINCE SEP 1 112 200 -88 86
SINCE JUL 1 122 245 -123 124
COOLING
YESTERDAY 0 0 0 6
MONTH TO DATE 17 29 -12 63
SINCE SEP 1 17 29 -12 63
SINCE JAN 1 467 441 26 538
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION S (190)
HIGHEST GUST SPEED 24 HIGHEST GUST DIRECTION SW (240)
AVERAGE WIND SPEED 9.0
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.3
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 83 1:00 AM
LOWEST 30 3:00 PM
AVERAGE 57
..........................................................
THE CASPER WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 68 88 1980
MINIMUM TEMPERATURE (F) 37 17 1985
SUNRISE AND SUNSET
SEPTEMBER 30 2025.....SUNRISE 7:02 AM MDT SUNSET 6:48 PM MDT
OCTOBER 1 2025.......SUNRISE 7:04 AM MDT SUNSET 6:46 PM MDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$