688
CDUS45 KRIW 220731
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
131 AM MDT TUE SEP 22 2026
...............................
..THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 21 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 71 4:26 PM 85 1966 73 -2 80
MINIMUM 43 6:01 AM 21 1983 40 3 53
AVERAGE 57 57 0
PRECIPITATION (IN)
YESTERDAY 0.00 1.09 1962 0.04 -0.04 T
MONTH TO DATE 0.69 0.59 0.10 2.11
SINCE SEP 1 0.69 0.59 0.10 2.11
SINCE JAN 1 7.03 9.42 -2.39 9.42
SNOWFALL (IN)
YESTERDAY 0.0 4.9 1994 0.1 -0.1 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
YESTERDAY 8 9 -1 0
MONTH TO DATE 54 114 -60 74
SINCE SEP 1 54 114 -60 74
SINCE JUL 1 59 159 -100 84
COOLING
YESTERDAY 0 0 0 2
MONTH TO DATE 43 29 14 17
SINCE SEP 1 43 29 14 17
SINCE JAN 1 636 441 195 467
...............................................................
WIND (MPH)
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION E (80)
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION E (90)
AVERAGE WIND SPEED 5.9
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.1
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 1:00 AM
LOWEST 32 5:00 PM
AVERAGE 65
......................................................
THE CASPER WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 72 87 1966
1992
2007
MINIMUM TEMPERATURE (F) 40 25 2000
SUNRISE AND SUNSET
SEPTEMBER 22 2026.....SUNRISE 6:53 AM MDT SUNSET 7:03 PM MDT
SEPTEMBER 23 2026.....SUNRISE 6:54 AM MDT SUNSET 7:01 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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