186
CDUS45 KRIW 210731
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
131 AM MDT SUN SEP 21 2025
...............................
..THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 20 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 2:53 PM 89 1956 74 2 81
MINIMUM 46 6:13 AM 16 1983 41 5 38
AVERAGE 61 57 4
PRECIPITATION (IN)
YESTERDAY 0.00 2.01 1989 0.04 -0.04 0.00
MONTH TO DATE 2.11 0.55 1.56 0.24
SINCE SEP 1 2.11 0.55 1.56 0.24
SINCE JAN 1 9.42 9.38 0.04 7.22
SNOWFALL (IN)
YESTERDAY 0.0 6.9 1995 0.1 -0.1 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 0
DEGREE DAYS
HEATING
YESTERDAY 4 8 -4 5
MONTH TO DATE 74 105 -31 46
SINCE SEP 1 74 105 -31 46
SINCE JUL 1 84 150 -66 84
COOLING
YESTERDAY 0 0 0 0
MONTH TO DATE 15 29 -14 51
SINCE SEP 1 15 29 -14 51
SINCE JAN 1 465 441 24 526
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WIND (MPH)
HIGHEST WIND SPEED 23 HIGHEST WIND DIRECTION SW (210)
HIGHEST GUST SPEED 31 HIGHEST GUST DIRECTION S (200)
AVERAGE WIND SPEED 7.5
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 96 4:00 AM
LOWEST 29 3:00 PM
AVERAGE 63
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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 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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