687
CDUS45 KRIW 010045
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
645 PM MDT TUE SEP 30 2025
...............................
..THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 30 2025
VALID TODAY AS OF 0600 PM LOCAL TIME.
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1939 TO 2025
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...............................................................
TEMPERATURE (F)
TODAY
MAXIMUM 77 2:26 PM 88 1980 68 9 65
MINIMUM 50 3:28 AM 17 1985 37 13 32
AVERAGE 64 52 12 49
PRECIPITATION (IN)
TODAY 0.00 0.66 1982 0.04 -0.04 0.00
MONTH TO DATE 2.55 0.95 1.60 0.24
SINCE SEP 1 2.55 0.95 1.60 0.24
SINCE JAN 1 9.86 9.78 0.08 7.22
SNOWFALL (IN)
TODAY MM 0.1 MM 0.0
MONTH TO DATE 0.0 1.5 -1.5 0.0
SINCE SEP 1 0.0 1.5 -1.5 0.0
SINCE JUL 1 0.0 1.5 -1.5 0.0
SNOW DEPTH MM
DEGREE DAYS
HEATING
TODAY 1 13 -12 16
MONTH TO DATE 113 213 -100 102
SINCE SEP 1 113 213 -100 102
SINCE JUL 1 123 258 -135 140
COOLING
TODAY 0 0 0 0
MONTH TO DATE 17 30 -13 63
SINCE SEP 1 17 30 -13 63
SINCE JAN 1 467 442 25 538
...............................................................
WIND (MPH)
HIGHEST WIND SPEED 25 HIGHEST WIND DIRECTION SW (230)
HIGHEST GUST SPEED 36 HIGHEST GUST DIRECTION SW (220)
AVERAGE WIND SPEED 16.0
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.1
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 69
LOWEST 30
AVERAGE 50
......................................................
THE CASPER WY CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 67 87 1992
MINIMUM TEMPERATURE (F) 36 20 1985
SUNRISE AND SUNSET
SEPTEMBER 30 2025.....SUNRISE 7:02 AM MDT SUNSET 6:48 PM MDT
OCTOBER 1 2025.......SUNRISE 7:04 AM MDT SUNSET 6:46 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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