504
CDUS45 KRIW 190046
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
646 PM MDT MON MAY 18 2026
...............................
..THE CASPER WY CLIMATE SUMMARY FOR MAY 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 38 2:43 PM 88 1992 68 -30 64
2009
MINIMUM 32 11:29 AM 25 1943 38 -6 43
AVERAGE 35 53 -18 54
PRECIPITATION (IN)
TODAY 0.57 1.19 1978 0.08 0.49 0.08
MONTH TO DATE 1.03 1.29 -0.26 0.49
SINCE MAR 1 2.47 3.54 -1.07 3.41
SINCE JAN 1 3.01 4.59 -1.58 4.13
SNOWFALL (IN)
TODAY MM 0.1 MM 0.0
MONTH TO DATE T 2.2 -2.2 0.3
SINCE MAR 1 11.4 23.0 -11.6 16.0
SINCE JUL 1 27.1 71.3 -44.2 26.5
SNOW DEPTH MM
DEGREE DAYS
HEATING
TODAY 30 12 18 11
MONTH TO DATE 245 283 -38 226
SINCE MAR 1 1451 1872 -421 1775
SINCE JUL 1 5628 7234 -1606 6790
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 31 HIGHEST WIND DIRECTION NE (30)
HIGHEST GUST SPEED 38 HIGHEST GUST DIRECTION NE (30)
AVERAGE WIND SPEED 18.0
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 1.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
RAIN
LIGHT RAIN
SNOW
LIGHT SNOW
FOG
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100
LOWEST 75
AVERAGE 88
......................................................
THE CASPER WY CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 68 89 1992
2009
MINIMUM TEMPERATURE (F) 38 27 1966
1968
SUNRISE AND SUNSET
MAY 18 2026...........SUNRISE 5:40 AM MDT SUNSET 8:25 PM MDT
MAY 19 2026...........SUNRISE 5:39 AM MDT SUNSET 8:26 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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