Climatological Report (Daily)
Issued by NWS
Issued by NWS
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CDUS45 KRIW 190045
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
645 PM MDT FRI SEP 18 2026
...................................
...THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 18 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 82 1:32 PM 92 2014 75 7 74
MINIMUM 51 12:08 AM 19 1965 42 9 44
AVERAGE 67 58 9 59
PRECIPITATION (IN)
TODAY 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)
TODAY MM 0.1 MM 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 MM
DEGREE DAYS
HEATING
TODAY 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
TODAY 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 10.1
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.1
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
THUNDERSTORM
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100
LOWEST 30
AVERAGE 65
..........................................................
THE CASPER WY CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 74 92 2010
MINIMUM TEMPERATURE (F) 41 23 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.
$$