786
CDUS45 KRIW 110734
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
134 AM MDT THU SEP 11 2025
...............................
..THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 10 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 90 4:00 PM 95 2021 79 11 89
MINIMUM 43 5:28 AM 27 2020 44 -1 52
AVERAGE 67 62 5
PRECIPITATION (IN)
YESTERDAY 0.00 0.40 1986 0.03 -0.03 0.00
MONTH TO DATE 0.01 0.24 -0.23 0.15
SINCE SEP 1 0.01 0.24 -0.23 0.15
SINCE JAN 1 7.32 9.07 -1.75 7.13
SNOWFALL (IN)
YESTERDAY 0.0 0.0 2020 0.1 -0.1 0.0
MONTH TO DATE 0.0 0.2 -0.2 0.0
SINCE SEP 1 0.0 0.2 -0.2 0.0
SINCE JUL 1 0.0 0.2 -0.2 0.0
SNOW DEPTH 0
DEGREE DAYS
HEATING
YESTERDAY 0 5 -5 0
MONTH TO DATE 32 38 -6 7
SINCE SEP 1 32 38 -6 7
SINCE JUL 1 42 83 -41 45
COOLING
YESTERDAY 2 1 1 6
MONTH TO DATE 9 20 -11 45
SINCE SEP 1 9 20 -11 45
SINCE JAN 1 459 432 27 520
...............................................................
WIND (MPH)
HIGHEST WIND SPEED 23 HIGHEST WIND DIRECTION S (200)
HIGHEST GUST SPEED 33 HIGHEST GUST DIRECTION S (180)
AVERAGE WIND SPEED 8.7
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 5:00 AM
LOWEST 13 4:00 PM
AVERAGE 53
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THE CASPER WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 78 91 1993
MINIMUM TEMPERATURE (F) 44 26 2014
SUNRISE AND SUNSET
SEPTEMBER 11 2025.....SUNRISE 6:42 AM MDT SUNSET 7:22 PM MDT
SEPTEMBER 12 2025.....SUNRISE 6:43 AM MDT SUNSET 7:20 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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