Climatological Report (Daily)
Issued by NWS
Issued by NWS
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CDUS45 KRIW 160727
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
127 AM MDT WED SEP 16 2026
...................................
...THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 15 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 72 4:00 PM 92 2000 76 -4 80
MINIMUM 36 5:41 AM 28 1947 43 -7 48
1965
AVERAGE 54 59 -5
PRECIPITATION (IN)
YESTERDAY 0.00 0.47 2017 0.04 -0.04 0.04
MONTH TO DATE 0.37 0.39 -0.02 0.05
SINCE SEP 1 0.37 0.39 -0.02 0.05
SINCE JAN 1 6.71 9.22 -2.51 7.36
SNOWFALL (IN)
YESTERDAY 0.0 0.7 1965 0.0 0.0 0.0
MONTH TO DATE 0.0 0.3 -0.3 0.0
SINCE SEP 1 0.0 0.3 -0.3 0.0
SINCE JUL 1 0.0 0.3 -0.3 0.0
SNOW DEPTH 0
DEGREE DAYS
HEATING
YESTERDAY 11 6 5 1
MONTH TO DATE 27 67 -40 41
SINCE SEP 1 27 67 -40 41
SINCE JUL 1 32 112 -80 51
COOLING
YESTERDAY 0 1 -1 0
MONTH TO DATE 41 25 16 15
SINCE SEP 1 41 25 16 15
SINCE JAN 1 634 437 197 465
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 20 HIGHEST WIND DIRECTION E (80)
HIGHEST GUST SPEED 26 HIGHEST GUST DIRECTION E (90)
AVERAGE WIND SPEED 9.9
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 82 5:00 AM
LOWEST 25 4:00 PM
AVERAGE 54
..........................................................
THE CASPER WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 76 94 2000
MINIMUM TEMPERATURE (F) 42 19 1965
SUNRISE AND SUNSET
SEPTEMBER 16 2026.....SUNRISE 6:47 AM MDT SUNSET 7:14 PM MDT
SEPTEMBER 17 2026.....SUNRISE 6:48 AM MDT SUNSET 7:12 PM MDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$