378
CDUS45 KRIW 150735
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
135 AM MDT TUE SEP 15 2026
...............................
..THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 14 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 77 3:42 PM 92 1948 77 0 79
MINIMUM 50 11:59 PM 28 1961 43 7 48
AVERAGE 64 60 4
PRECIPITATION (IN)
YESTERDAY 0.01 0.52 1982 0.02 -0.01 0.00
MONTH TO DATE 0.37 0.35 0.02 0.01
SINCE SEP 1 0.37 0.35 0.02 0.01
SINCE JAN 1 6.71 9.18 -2.47 7.32
SNOWFALL (IN)
YESTERDAY 0.0 3.6 1982 0.0 0.0 0.0
MONTH TO DATE 0.0 0.3 -0.3 0.0
SINCE SEP 1 0.0 0.3 -0.3 0.0
SINCE JUL 1 0.0 0.3 -0.3 0.0
SNOW DEPTH 0
DEGREE DAYS
HEATING
YESTERDAY 1 6 -5 1
MONTH TO DATE 16 61 -45 40
SINCE SEP 1 16 61 -45 40
SINCE JUL 1 21 106 -85 50
COOLING
YESTERDAY 0 1 -1 0
MONTH TO DATE 41 24 17 15
SINCE SEP 1 41 24 17 15
SINCE JAN 1 634 436 198 465
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WIND (MPH)
HIGHEST WIND SPEED 32 HIGHEST WIND DIRECTION W (270)
HIGHEST GUST SPEED 59 HIGHEST GUST DIRECTION SW (240)
AVERAGE WIND SPEED 14.9
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.2
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 83 12:00 AM
LOWEST 14 5:00 PM
AVERAGE 49
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THE CASPER WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 76 92 2000
MINIMUM TEMPERATURE (F) 43 28 1947
1965
SUNRISE AND SUNSET
SEPTEMBER 15 2026.....SUNRISE 6:46 AM MDT SUNSET 7:15 PM MDT
SEPTEMBER 16 2026.....SUNRISE 6:47 AM MDT SUNSET 7:14 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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