580
CDUS45 KRIW 180740
CLIRIW
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1240 AM MST THU DEC 18 2025
...............................
..THE RIVERTON WY CLIMATE SUMMARY FOR DECEMBER 17 2025
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1995 TO 2025
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...............................................................
TEMPERATURE (F)
YESTERDAY
MAXIMUM 58R 12:38 PM 58 2013 30 28 37
MINIMUM 30 11:56 PM -23 2016 8 22 19
AVERAGE 44 19 25 28
PRECIPITATION (IN)
YESTERDAY 0.00 0.06 0.01 -0.01 0.00
MONTH TO DATE 0.14 0.15 -0.01 T
SINCE DEC 1 0.14 0.15 -0.01 T
SINCE JAN 1 9.10 8.45 0.65 6.22
SNOWFALL (IN)
YESTERDAY 0.0 2.2 2002 0.0
MONTH TO DATE 1.5 T
SINCE DEC 1 1.5 T
SINCE JUL 1 3.5 3.8
SNOW DEPTH MM
DEGREE DAYS
HEATING
YESTERDAY 21 46 -25 37
MONTH TO DATE 487 753 -266 614
SINCE DEC 1 487 753 -266 614
SINCE JUL 1 1930 2650 -720 2131
COOLING
YESTERDAY 0 0 0 0
MONTH TO DATE 0 0 0 0
SINCE DEC 1 0 0 0 0
SINCE JAN 1 611 499 112 610
...............................................................
WIND (MPH)
HIGHEST WIND SPEED 47 HIGHEST WIND DIRECTION W (290)
HIGHEST GUST SPEED 67 HIGHEST GUST DIRECTION W (280)
AVERAGE WIND SPEED 22.0
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 61 5:00 AM
LOWEST 20 3:00 PM
AVERAGE 41
......................................................
THE RIVERTON WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 30 59 2013
MINIMUM TEMPERATURE (F) 7 -18 2016
SUNRISE AND SUNSET
DECEMBER 18 2025......SUNRISE 7:40 AM MST SUNSET 4:41 PM MST
DECEMBER 19 2025......SUNRISE 7:41 AM MST SUNSET 4:41 PM MST
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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