464
CDUS45 KRIW 210732
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
132 AM MDT MON SEP 21 2026
...............................
..THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 20 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 62 12:42 PM 89 1956 74 -12 76
MINIMUM 47 8:18 AM 16 1983 41 6 46
AVERAGE 55 57 -2
PRECIPITATION (IN)
YESTERDAY 0.27 2.01 1989 0.04 0.23 0.00
MONTH TO DATE 0.69 0.55 0.14 2.11
SINCE SEP 1 0.69 0.55 0.14 2.11
SINCE JAN 1 7.03 9.38 -2.35 9.42
SNOWFALL (IN)
YESTERDAY MM 6.9 1995 0.1 MM 0.0
MONTH TO DATE 0.0 0.6 -0.6 0.0
SINCE SEP 1 0.0 0.6 -0.6 0.0
SINCE JUL 1 0.0 0.6 -0.6 0.0
SNOW DEPTH MM
DEGREE DAYS
HEATING
YESTERDAY 10 8 2 4
MONTH TO DATE 46 105 -59 74
SINCE SEP 1 46 105 -59 74
SINCE JUL 1 51 150 -99 84
COOLING
YESTERDAY 0 0 0 0
MONTH TO DATE 43 29 14 15
SINCE SEP 1 43 29 14 15
SINCE JAN 1 636 441 195 465
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WIND (MPH)
HIGHEST WIND SPEED 23 HIGHEST WIND DIRECTION W (290)
HIGHEST GUST SPEED 32 HIGHEST GUST DIRECTION W (280)
AVERAGE WIND SPEED 9.4
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 1.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 2:00 AM
LOWEST 62 1:00 PM
AVERAGE 80
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THE CASPER WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 73 85 1966
MINIMUM TEMPERATURE (F) 40 21 1983
SUNRISE AND SUNSET
SEPTEMBER 21 2026.....SUNRISE 6:52 AM MDT SUNSET 7:05 PM MDT
SEPTEMBER 22 2026.....SUNRISE 6:53 AM MDT SUNSET 7:03 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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