Climatological Report (Daily)
Issued by NWS
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CDUS45 KRIW 180730
CLIP60
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
130 AM MDT THU SEP 18 2025
...................................
...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR SEPTEMBER 17 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 60 3:01 PM 73 2009 60 0 45
2020
MINIMUM 29 6:22 AM 24 2003 30 -1 32
2017
AVERAGE 45 45 0 39
PRECIPITATION (IN)
YESTERDAY 0.00 0.68 2013 0.05 -0.05 0.56
MONTH TO DATE 0.90 0.85 0.05 1.16
SINCE SEP 1 0.90 0.85 0.05 1.16
SINCE JAN 1 12.61 16.11 -3.50 16.35
DEGREE DAYS
HEATING
YESTERDAY 20 20 0 26
MONTH TO DATE 236 296 -60 246
SINCE SEP 1 236 296 -60 246
SINCE JUL 1 752 938 -186 823
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 SE (140)
HIGHEST GUST SPEED 13 HIGHEST GUST DIRECTION E (110)
AVERAGE WIND SPEED 1.1
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 100 6:00 AM
LOWEST 33 4:00 PM
AVERAGE 67
..........................................................
THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 60 75 2009
MINIMUM TEMPERATURE (F) 30 18 2003
SUNRISE AND SUNSET
SEPTEMBER 18 2025.....SUNRISE 7:05 AM MDT SUNSET 7:26 PM MDT
SEPTEMBER 19 2025.....SUNRISE 7:06 AM MDT SUNSET 7:24 PM MDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$