Climatological Report (Daily)
Issued by NWS
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181
CDUS45 KRIW 210731
CLIP60
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
131 AM MDT SUN SEP 21 2025
...................................
...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR SEPTEMBER 20 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 69R 3:21 PM 69 2012 59 10 58
2016
MINIMUM 31 6:34 AM 20 2000 29 2 29
AVERAGE 50 44 6 44
PRECIPITATION (IN)
YESTERDAY 0.00 0.60 2019 0.06 -0.06 0.00
MONTH TO DATE 0.90 1.02 -0.12 1.43
SINCE SEP 1 0.90 1.02 -0.12 1.43
SINCE JAN 1 12.61 16.28 -3.67 16.62
DEGREE DAYS
HEATING
YESTERDAY 15 21 -6 21
MONTH TO DATE 286 358 -72 313
SINCE SEP 1 286 358 -72 313
SINCE JUL 1 802 1000 -198 890
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 12 HIGHEST WIND DIRECTION W (280)
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION W (280)
AVERAGE WIND SPEED 1.9
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 96 6:00 AM
LOWEST 20 3:00 PM
AVERAGE 58
..........................................................
THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 58 69 2001
2012
MINIMUM TEMPERATURE (F) 29 22 2004
2021
SUNRISE AND SUNSET
SEPTEMBER 21 2025.....SUNRISE 7:08 AM MDT SUNSET 7:20 PM MDT
SEPTEMBER 22 2025.....SUNRISE 7:09 AM MDT SUNSET 7:18 PM MDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$