286
CDUS45 KRIW 170045
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
645 PM MDT WED SEP 16 2026
...............................
..THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 16 2026
VALID TODAY AS OF 0600 PM LOCAL TIME.
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)
TODAY
MAXIMUM 80 3:52 PM 94 2000 76 4 68
MINIMUM 47 12:34 AM 19 1965 42 5 46
AVERAGE 64 59 5 57
PRECIPITATION (IN)
TODAY 0.00 1.24 2025 0.03 -0.03 1.24
MONTH TO DATE 0.37 0.42 -0.05 1.29
SINCE SEP 1 0.37 0.42 -0.05 1.29
SINCE JAN 1 6.71 9.25 -2.54 8.60
SNOWFALL (IN)
TODAY MM 0.1 MM 0.0
MONTH TO DATE 0.0 0.4 -0.4 0.0
SINCE SEP 1 0.0 0.4 -0.4 0.0
SINCE JUL 1 0.0 0.4 -0.4 0.0
SNOW DEPTH MM
DEGREE DAYS
HEATING
TODAY 1 7 -6 8
MONTH TO DATE 28 74 -46 49
SINCE SEP 1 28 74 -46 49
SINCE JUL 1 33 119 -86 59
COOLING
TODAY 0 1 -1 0
MONTH TO DATE 41 26 15 15
SINCE SEP 1 41 26 15 15
SINCE JAN 1 634 438 196 465
...............................................................
WIND (MPH)
HIGHEST WIND SPEED 22 HIGHEST WIND DIRECTION SW (220)
HIGHEST GUST SPEED 32 HIGHEST GUST DIRECTION SW (210)
AVERAGE WIND SPEED 12.6
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.2
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 80
LOWEST 30
AVERAGE 55
......................................................
THE CASPER WY CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 75 89 2000
MINIMUM TEMPERATURE (F) 42 19 1965
SUNRISE AND SUNSET
SEPTEMBER 16 2026.....SUNRISE 6:47 AM MDT SUNSET 7:14 PM MDT
SEPTEMBER 17 2026.....SUNRISE 6:48 AM MDT SUNSET 7:12 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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