561
CDUS45 KRIW 180733
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
133 AM MDT MON MAY 18 2026
...............................
..THE CASPER WY CLIMATE SUMMARY FOR MAY 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 56 MM 87 1948 67 -11 71
MINIMUM 37 9:00 PM 28 1942 38 -1 29
1986
1990
AVERAGE 47 52 -5
PRECIPITATION (IN)
YESTERDAY 0.11 2.22 2000 0.08 0.03 0.00
MONTH TO DATE 0.46 1.21 -0.75 0.41
SINCE MAR 1 1.90 3.46 -1.56 3.33
SINCE JAN 1 2.44 4.51 -2.07 4.05
SNOWFALL (IN)
YESTERDAY 0.0 0.4 1978 0.1 -0.1 0.0
MONTH TO DATE T 2.1 -2.1 0.3
SINCE MAR 1 11.4 22.9 -11.5 16.0
SINCE JUL 1 27.1 71.2 -44.1 26.5
SNOW DEPTH 0
DEGREE DAYS
HEATING
YESTERDAY 18 13 5 15
MONTH TO DATE 215 271 -56 215
SINCE MAR 1 1421 1860 -439 1764
SINCE JUL 1 5598 7222 -1624 6779
COOLING
YESTERDAY 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 20 HIGHEST WIND DIRECTION NE (30)
HIGHEST GUST SPEED 36 HIGHEST GUST DIRECTION NE (30)
AVERAGE WIND SPEED 12.9
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 92 9:00 PM
LOWEST 39 4:00 PM
AVERAGE 66
......................................................
THE CASPER WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 68 88 1992
2009
MINIMUM TEMPERATURE (F) 38 25 1943
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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