Climatological Report (Daily)
Issued by NWS
Issued by NWS
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CDUS45 KRIW 180726
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
126 AM MDT FRI SEP 18 2026
...................................
...THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 17 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 69 4:56 PM 89 2000 75 -6 62
MINIMUM 51 10:47 PM 19 1965 42 9 49
AVERAGE 60 58 2
PRECIPITATION (IN)
YESTERDAY T 0.82 2025 0.03 -0.03 0.82
MONTH TO DATE 0.37 0.45 -0.08 2.11
SINCE SEP 1 0.37 0.45 -0.08 2.11
SINCE JAN 1 6.71 9.28 -2.57 9.42
SNOWFALL (IN)
YESTERDAY 0.0 4.4 1965 0.0 0.0 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 5 7 -2 9
MONTH TO DATE 33 81 -48 58
SINCE SEP 1 33 81 -48 58
SINCE JUL 1 38 126 -88 68
COOLING
YESTERDAY 0 1 -1 0
MONTH TO DATE 41 27 14 15
SINCE SEP 1 41 27 14 15
SINCE JAN 1 634 439 195 465
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION E (80)
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION E (80)
AVERAGE WIND SPEED 5.5
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.4
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
FOG
FOG W/VISIBILITY <= 1/4 MILE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 10:00 PM
LOWEST 51 8:00 AM
AVERAGE 76
..........................................................
THE CASPER WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 75 92 2014
MINIMUM TEMPERATURE (F) 42 19 1965
SUNRISE AND SUNSET
SEPTEMBER 18 2026.....SUNRISE 6:49 AM MDT SUNSET 7:10 PM MDT
SEPTEMBER 19 2026.....SUNRISE 6:50 AM MDT SUNSET 7:08 PM MDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$