366
CDUS45 KRIW 210045
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
645 PM MDT SAT SEP 20 2025
...............................
..THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 20 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 76 2:53 PM 89 1956 74 2 81
MINIMUM 46 6:13 AM 16 1983 41 5 38
AVERAGE 61 57 4 60
PRECIPITATION (IN)
TODAY 0.00 2.01 1989 0.04 -0.04 0.00
MONTH TO DATE 2.11 0.55 1.56 0.24
SINCE SEP 1 2.11 0.55 1.56 0.24
SINCE JAN 1 9.42 9.38 0.04 7.22
SNOWFALL (IN)
TODAY MM 0.1 MM 0.0
MONTH TO DATE 0.0 0.6 -0.6 0.0
SINCE SEP 1 0.0 0.6 -0.6 0.0
SINCE JUL 1 0.0 0.6 -0.6 0.0
SNOW DEPTH MM
DEGREE DAYS
HEATING
TODAY 4 8 -4 5
MONTH TO DATE 74 105 -31 46
SINCE SEP 1 74 105 -31 46
SINCE JUL 1 84 150 -66 84
COOLING
TODAY 0 0 0 0
MONTH TO DATE 15 29 -14 51
SINCE SEP 1 15 29 -14 51
SINCE JAN 1 465 441 24 526
...............................................................
WIND (MPH)
HIGHEST WIND SPEED 23 HIGHEST WIND DIRECTION SW (210)
HIGHEST GUST SPEED 31 HIGHEST GUST DIRECTION S (200)
AVERAGE WIND SPEED 7.9
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 96
LOWEST 29
AVERAGE 63
......................................................
THE CASPER WY CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 73 85 1966
MINIMUM TEMPERATURE (F) 40 21 1983
SUNRISE AND SUNSET
SEPTEMBER 20 2025.....SUNRISE 6:51 AM MDT SUNSET 7:06 PM MDT
SEPTEMBER 21 2025.....SUNRISE 6:52 AM MDT SUNSET 7:04 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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