251
CDUS45 KRIW 220045
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
645 PM MDT THU MAY 21 2026
...............................
..THE CASPER WY CLIMATE SUMMARY FOR MAY 21 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 50 1:40 PM 87 1964 69 -19 61
2006
MINIMUM 33 4:44 AM 26 2001 39 -6 31
AVERAGE 42 54 -12 46
PRECIPITATION (IN)
TODAY 0.18 1.04 1962 0.08 0.10 0.02
MONTH TO DATE 1.26 1.52 -0.26 0.74
SINCE MAR 1 2.70 3.77 -1.07 3.66
SINCE JAN 1 3.24 4.82 -1.58 4.38
SNOWFALL (IN)
TODAY MM 0.0 MM 0.0
MONTH TO DATE 2.5 2.3 0.2 0.3
SINCE MAR 1 13.9 23.1 -9.2 16.0
SINCE JUL 1 29.6 71.4 -41.8 26.5
SNOW DEPTH MM
DEGREE DAYS
HEATING
TODAY 23 11 12 19
MONTH TO DATE 315 318 -3 283
SINCE MAR 1 1521 1907 -386 1832
SINCE JUL 1 5698 7269 -1571 6847
COOLING
TODAY 0 0 0 0
MONTH TO DATE 0 0 0 0
SINCE MAR 1 0 0 0 0
SINCE JAN 1 0 0 0 0
...............................................................
WIND (MPH)
HIGHEST WIND SPEED 30 HIGHEST WIND DIRECTION N (10)
HIGHEST GUST SPEED 40 HIGHEST GUST DIRECTION N (10)
AVERAGE WIND SPEED 9.8
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.6
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
THUNDERSTORM
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93
LOWEST 49
AVERAGE 71
......................................................
THE CASPER WY CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 69 86 1980
2006
MINIMUM TEMPERATURE (F) 39 22 2022
SUNRISE AND SUNSET
MAY 21 2026...........SUNRISE 5:37 AM MDT SUNSET 8:28 PM MDT
MAY 22 2026...........SUNRISE 5:36 AM MDT SUNSET 8:29 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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