114
CDUS45 KRIW 120728
CLICPR
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
128 AM MDT SAT SEP 12 2026
...............................
..THE CASPER WY CLIMATE SUMMARY FOR SEPTEMBER 11 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 86 2:05 PM 91 1993 78 8 89
MINIMUM 49 11:59 PM 26 2014 44 5 53
AVERAGE 68 61 7
PRECIPITATION (IN)
YESTERDAY T 0.63 1973 0.03 -0.03 T
MONTH TO DATE 0.01 0.27 -0.26 0.01
SINCE SEP 1 0.01 0.27 -0.26 0.01
SINCE JAN 1 6.35 9.10 -2.75 7.32
SNOWFALL (IN)
YESTERDAY MM 3.0 1974 0.0 MM 0.0
MONTH TO DATE 0.0 0.2 -0.2 0.0
SINCE SEP 1 0.0 0.2 -0.2 0.0
SINCE JUL 1 0.0 0.2 -0.2 0.0
SNOW DEPTH 0
DEGREE DAYS
HEATING
YESTERDAY 0 5 -5 0
MONTH TO DATE 8 43 -35 32
SINCE SEP 1 8 43 -35 32
SINCE JUL 1 13 88 -75 42
COOLING
YESTERDAY 3 1 2 6
MONTH TO DATE 41 21 20 15
SINCE SEP 1 41 21 20 15
SINCE JAN 1 634 433 201 465
...............................................................
WIND (MPH)
HIGHEST WIND SPEED 29 HIGHEST WIND DIRECTION N (10)
HIGHEST GUST SPEED 38 HIGHEST GUST DIRECTION W (260)
AVERAGE WIND SPEED 14.1
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.2
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 59 9:00 PM
LOWEST 17 1:00 PM
AVERAGE 38
......................................................
THE CASPER WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 78 94 1990
MINIMUM TEMPERATURE (F) 44 25 2014
SUNRISE AND SUNSET
SEPTEMBER 12 2026.....SUNRISE 6:42 AM MDT SUNSET 7:21 PM MDT
SEPTEMBER 13 2026.....SUNRISE 6:44 AM MDT SUNSET 7:19 PM MDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page