320
CDUS45 KRIW 270731
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
131 AM MDT SAT SEP 27 2025
...............................
..THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 26 2025
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)
YESTERDAY
MAXIMUM 79 11:34 AM 91 2015 70 9 90
MINIMUM 46 11:59 PM 21 1972 38 8 51
AVERAGE 63 54 9
PRECIPITATION (IN)
YESTERDAY 0.00 0.29 2013 0.05 -0.05 0.00
MONTH TO DATE 2.49 0.79 1.70 0.24
SINCE SEP 1 2.49 0.79 1.70 0.24
SINCE JAN 1 9.80 9.62 0.18 7.22
SNOWFALL (IN)
YESTERDAY 0.0 T 2013 0.1 -0.1 0.0
MONTH TO DATE 0.0 1.1 -1.1 0.0
SINCE SEP 1 0.0 1.1 -1.1 0.0
SINCE JUL 1 0.0 1.1 -1.1 0.0
SNOW DEPTH 0
DEGREE DAYS
HEATING
YESTERDAY 2 11 -9 0
MONTH TO DATE 104 164 -60 85
SINCE SEP 1 104 164 -60 85
SINCE JUL 1 114 209 -95 123
COOLING
YESTERDAY 0 0 0 6
MONTH TO DATE 17 29 -12 57
SINCE SEP 1 17 29 -12 57
SINCE JAN 1 467 441 26 532
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WIND (MPH)
HIGHEST WIND SPEED 23 HIGHEST WIND DIRECTION SW (220)
HIGHEST GUST SPEED 29 HIGHEST GUST DIRECTION SW (220)
AVERAGE WIND SPEED 11.6
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.1
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 66 6:00 PM
LOWEST 21 11:00 AM
AVERAGE 44
......................................................
THE CASPER WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 70 89 2015
MINIMUM TEMPERATURE (F) 38 22 1945
1964
SUNRISE AND SUNSET
SEPTEMBER 27 2025.....SUNRISE 6:59 AM MDT SUNSET 6:53 PM MDT
SEPTEMBER 28 2025.....SUNRISE 7:00 AM MDT SUNSET 6:52 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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