368
CDUS45 KRIW 170736
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
136 AM MDT WED SEP 17 2025
...............................
..THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 16 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 68 2:00 PM 94 2000 76 -8 88
MINIMUM 46 4:01 AM 19 1965 42 4 41
AVERAGE 57 59 -2
PRECIPITATION (IN)
YESTERDAY 1.24R 0.56 2006 0.03 1.21 T
MONTH TO DATE 1.29 0.42 0.87 0.17
SINCE SEP 1 1.29 0.42 0.87 0.17
SINCE JAN 1 8.60 9.25 -0.65 7.15
SNOWFALL (IN)
YESTERDAY 0.0 2.1 1965 0.1 -0.1 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 0
DEGREE DAYS
HEATING
YESTERDAY 8 7 1 0
MONTH TO DATE 49 74 -25 25
SINCE SEP 1 49 74 -25 25
SINCE JUL 1 59 119 -60 63
COOLING
YESTERDAY 0 1 -1 0
MONTH TO DATE 15 26 -11 51
SINCE SEP 1 15 26 -11 51
SINCE JAN 1 465 438 27 526
...............................................................
WIND (MPH)
HIGHEST WIND SPEED 37 HIGHEST WIND DIRECTION W (280)
HIGHEST GUST SPEED 43 HIGHEST GUST DIRECTION W (280)
AVERAGE WIND SPEED 8.1
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.6
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
THUNDERSTORM
HEAVY RAIN
RAIN
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 1:00 AM
LOWEST 39 3:00 PM
AVERAGE 68
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THE CASPER WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 75 89 2000
MINIMUM TEMPERATURE (F) 42 19 1965
SUNRISE AND SUNSET
SEPTEMBER 17 2025.....SUNRISE 6:48 AM MDT SUNSET 7:11 PM MDT
SEPTEMBER 18 2025.....SUNRISE 6:49 AM MDT SUNSET 7:10 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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