Climatological Report (Daily)
Issued by NWS
Issued by NWS
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CDUS45 KRIW 300734
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
134 AM MDT WED SEP 30 2026
...................................
...THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 29 2026...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1939 TO 2026
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...................................................................
TEMPERATURE (F)
YESTERDAY
MAXIMUM 74 3:50 PM 91 2024 68 6 76
MINIMUM 40 3:38 AM 18 1984 37 3 51
AVERAGE 57 53 4
PRECIPITATION (IN)
YESTERDAY 0.00 0.50 1995 0.04 -0.04 0.00
2021
MONTH TO DATE 0.76 0.91 -0.15 2.55
SINCE SEP 1 0.76 0.91 -0.15 2.55
SINCE JAN 1 7.10 9.74 -2.64 9.86
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 8 12 -4 1
MONTH TO DATE 100 200 -100 112
SINCE SEP 1 100 200 -100 112
SINCE JUL 1 105 245 -140 122
COOLING
YESTERDAY 0 0 0 0
MONTH TO DATE 45 29 16 17
SINCE SEP 1 45 29 16 17
SINCE JAN 1 638 441 197 467
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION NW (320)
HIGHEST GUST SPEED 26 HIGHEST GUST DIRECTION W (290)
AVERAGE WIND SPEED 7.1
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 12:00 AM
LOWEST 25 5:00 PM
AVERAGE 61
..........................................................
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 2026.....SUNRISE 7:02 AM MDT SUNSET 6:49 PM MDT
OCTOBER 1 2026.......SUNRISE 7:03 AM MDT SUNSET 6:47 PM MDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$