011
CDUS45 KRIW 160731
CLIP60
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
131 AM MDT TUE SEP 16 2025
...............................
..THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR SEPTEMBER 15 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 56 3:27 PM 78 2000 61 -5 71
MINIMUM 32 11:53 PM 26 2003 31 1 29
2004
2005
AVERAGE 44 46 -2 50
PRECIPITATION (IN)
YESTERDAY 0.01 0.86 2017 0.05 -0.04 0.00
MONTH TO DATE 0.87 0.75 0.12 0.54
SINCE SEP 1 0.87 0.75 0.12 0.54
SINCE JAN 1 12.58 16.01 -3.43 15.73
DEGREE DAYS
HEATING
YESTERDAY 21 19 2 15
MONTH TO DATE 193 256 -63 207
SINCE SEP 1 193 256 -63 207
SINCE JUL 1 709 898 -189 784
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 14 HIGHEST WIND DIRECTION W (270)
HIGHEST GUST SPEED 27 HIGHEST GUST DIRECTION W (290)
AVERAGE WIND SPEED 3.9
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 92 4:00 AM
LOWEST 32 3:00 PM
AVERAGE 62
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THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 61 77 2000
MINIMUM TEMPERATURE (F) 30 27 2007
2016
2017
SUNRISE AND SUNSET
SEPTEMBER 16 2025.....SUNRISE 7:02 AM MDT SUNSET 7:30 PM MDT
SEPTEMBER 17 2025.....SUNRISE 7:03 AM MDT SUNSET 7:28 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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