Climatological Report (Daily)
Issued by NWS
Issued by NWS
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CDUS45 KRIW 200734
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
134 AM MDT SUN SEP 20 2026
...................................
...THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 19 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 75 MM 92 2010 74 1 76
MINIMUM 49 MM 23 1965 41 8 41
AVERAGE 62 58 4
PRECIPITATION (IN)
YESTERDAY 0.05 0.47 1948 0.03 0.02 0.00
MONTH TO DATE 0.42 0.51 -0.09 2.11
SINCE SEP 1 0.42 0.51 -0.09 2.11
SINCE JAN 1 6.76 9.34 -2.58 9.42
SNOWFALL (IN)
YESTERDAY 0.0 1.1 1965 0.0 0.0 0.0
MONTH TO DATE 0.0 0.5 -0.5 0.0
SINCE SEP 1 0.0 0.5 -0.5 0.0
SINCE JUL 1 0.0 0.5 -0.5 0.0
SNOW DEPTH 0
DEGREE DAYS
HEATING
YESTERDAY 3 8 -5 6
MONTH TO DATE 36 97 -61 70
SINCE SEP 1 36 97 -61 70
SINCE JUL 1 41 142 -101 80
COOLING
YESTERDAY 0 1 -1 0
MONTH TO DATE 43 29 14 15
SINCE SEP 1 43 29 14 15
SINCE JAN 1 636 441 195 465
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 20 HIGHEST WIND DIRECTION N (10)
HIGHEST GUST SPEED 38 HIGHEST GUST DIRECTION SW (220)
AVERAGE WIND SPEED 10.5
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.4
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 92 2:00 AM
LOWEST 27 5:00 PM
AVERAGE 60
..........................................................
THE CASPER WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 74 89 1956
MINIMUM TEMPERATURE (F) 41 16 1983
SUNRISE AND SUNSET
SEPTEMBER 20 2026.....SUNRISE 6:51 AM MDT SUNSET 7:06 PM MDT
SEPTEMBER 21 2026.....SUNRISE 6:52 AM MDT SUNSET 7:05 PM MDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$