260
CDUS45 KRIW 100731
CLIP60
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
131 AM MDT WED SEP 10 2025
...............................
..THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR SEPTEMBER 9 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 67 1:35 PM 81 2021 64 3 71
MINIMUM 33 3:52 AM 18 2020 32 1 37
AVERAGE 50 48 2 54
PRECIPITATION (IN)
YESTERDAY 0.04 0.28 2014 0.05 -0.01 0.00
MONTH TO DATE 0.80 0.45 0.35 0.14
SINCE SEP 1 0.80 0.45 0.35 0.14
SINCE JAN 1 12.51 15.71 -3.20 15.33
DEGREE DAYS
HEATING
YESTERDAY 15 17 -2 11
MONTH TO DATE 107 145 -38 96
SINCE SEP 1 107 145 -38 96
SINCE JUL 1 623 787 -164 673
COOLING
YESTERDAY 0 0 0 0
MONTH TO DATE 0 0 0 0
SINCE SEP 1 0 0 0 0
SINCE JAN 1 1 0 1 0
...............................................................
WIND (MPH)
HIGHEST WIND SPEED 7 HIGHEST WIND DIRECTION NW (310)
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION S (190)
AVERAGE WIND SPEED 1.4
SKY COVER
POSSIBLE SUNSHINE MM
AVERAGE SKY COVER 0.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
LIGHT RAIN
RELATIVE HUMIDITY (PERCENT)
HIGHEST 96 10:00 PM
LOWEST 29 12:00 PM
AVERAGE 63
......................................................
THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 63 75 2021
MINIMUM TEMPERATURE (F) 32 22 2007
SUNRISE AND SUNSET
SEPTEMBER 10 2025.....SUNRISE 6:55 AM MDT SUNSET 7:41 PM MDT
SEPTEMBER 11 2025.....SUNRISE 6:56 AM MDT SUNSET 7:39 PM MDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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