948
CDUS45 KRIW 190730
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
130 AM MDT SAT SEP 19 2026
...............................
..THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 18 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 82 1:32 PM 92 2014 75 7 74
MINIMUM 51 12:08 AM 19 1965 42 9 44
AVERAGE 67 58 9
PRECIPITATION (IN)
YESTERDAY T 0.57 1946 0.03 -0.03 0.00
MONTH TO DATE 0.37 0.48 -0.11 2.11
SINCE SEP 1 0.37 0.48 -0.11 2.11
SINCE JAN 1 6.71 9.31 -2.60 9.42
SNOWFALL (IN)
YESTERDAY 0.0 T 1988 0.1 -0.1 0.0
MONTH TO DATE 0.0 0.5 -0.5 0.0
SINCE SEP 1 0.0 0.5 -0.5 0.0
SINCE JUL 1 0.0 0.5 -0.5 0.0
SNOW DEPTH 0
DEGREE DAYS
HEATING
YESTERDAY 0 8 -8 6
MONTH TO DATE 33 89 -56 64
SINCE SEP 1 33 89 -56 64
SINCE JUL 1 38 134 -96 74
COOLING
YESTERDAY 2 1 1 0
MONTH TO DATE 43 28 15 15
SINCE SEP 1 43 28 15 15
SINCE JAN 1 636 440 196 465
...............................................................
WIND (MPH)
HIGHEST WIND SPEED 39 HIGHEST WIND DIRECTION W (260)
HIGHEST GUST SPEED 54 HIGHEST GUST DIRECTION W (260)
AVERAGE WIND SPEED 9.4
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.2
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
THUNDERSTORM
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 12:00 AM
LOWEST 30 2:00 PM
AVERAGE 65
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THE CASPER WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 74 92 2010
MINIMUM TEMPERATURE (F) 41 23 1965
SUNRISE AND SUNSET
SEPTEMBER 19 2026.....SUNRISE 6:50 AM MDT SUNSET 7:08 PM MDT
SEPTEMBER 20 2026.....SUNRISE 6:51 AM MDT SUNSET 7:06 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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