363
CDUS45 KRIW 170736
CLIP60
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
136 AM MDT WED SEP 17 2025
...............................
..THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR SEPTEMBER 16 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 54 1:02 PM 77 2000 61 -7 66
MINIMUM 30 2:28 AM 27 2007 30 0 37
2016
2017
AVERAGE 42 45 -3 52
PRECIPITATION (IN)
YESTERDAY 0.03 0.38 2022 0.05 -0.02 0.06
MONTH TO DATE 0.90 0.80 0.10 0.60
SINCE SEP 1 0.90 0.80 0.10 0.60
SINCE JAN 1 12.61 16.06 -3.45 15.79
DEGREE DAYS
HEATING
YESTERDAY 23 20 3 13
MONTH TO DATE 216 276 -60 220
SINCE SEP 1 216 276 -60 220
SINCE JUL 1 732 918 -186 797
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 N (10)
HIGHEST GUST SPEED 13 HIGHEST GUST DIRECTION NE (40)
AVERAGE WIND SPEED 1.6
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 6:00 AM
LOWEST 54 1:00 PM
AVERAGE 73
......................................................
THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 60 73 2009
2020
MINIMUM TEMPERATURE (F) 30 24 2003
2017
SUNRISE AND SUNSET
SEPTEMBER 17 2025.....SUNRISE 7:03 AM MDT SUNSET 7:28 PM MDT
SEPTEMBER 18 2025.....SUNRISE 7:05 AM MDT SUNSET 7:26 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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