470
CDUS45 KRIW 130730
CLIP60
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
1230 AM MST SAT DEC 13 2025
...............................
..THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR DECEMBER 12 2025
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1998 TO 2025
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...............................................................
TEMPERATURE (F)
YESTERDAY
MAXIMUM 38 1:32 PM 46 2014 23 15 31
MINIMUM 31 11:59 PM -9 2020 3 28 9
AVERAGE 35 13 22 20
PRECIPITATION (IN)
YESTERDAY 0.01 0.24 2019 0.08 -0.07 0.01
MONTH TO DATE 0.96 0.87 0.09 0.08
SINCE DEC 1 0.96 0.87 0.09 0.08
SINCE JAN 1 18.70 21.61 -2.91 18.46
DEGREE DAYS
HEATING
YESTERDAY 30 52 -22 45
MONTH TO DATE 492 609 -117 559
SINCE DEC 1 492 609 -117 559
SINCE JUL 1 3450 4116 -666 3666
COOLING
YESTERDAY 0 0 0 0
MONTH TO DATE 0 0 0 0
SINCE DEC 1 0 0 0 0
SINCE JAN 1 1 0 1 0
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WIND (MPH)
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION W (260)
HIGHEST GUST SPEED 24 HIGHEST GUST DIRECTION W (270)
AVERAGE WIND SPEED 6.1
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 85 11:00 AM
LOWEST 61 11:00 PM
AVERAGE 73
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THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 23 37 1998
MINIMUM TEMPERATURE (F) 3 -10 2020
SUNRISE AND SUNSET
DECEMBER 13 2025......SUNRISE 7:50 AM MST SUNSET 4:42 PM MST
DECEMBER 14 2025......SUNRISE 7:51 AM MST SUNSET 4:42 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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