Climatological Report (Daily)
Issued by NWS
Issued by NWS
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662
CDUS45 KRIW 180733
CLIP60
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
133 AM MDT MON AUG 18 2025
...................................
...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR AUGUST 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 72 1:52 PM 85 2020 71 1 76
MINIMUM 40 3:08 AM 28 2009 37 3 36
AVERAGE 56 54 2 56
PRECIPITATION (IN)
YESTERDAY 0.02 0.62 2007 0.04 -0.02 0.00
MONTH TO DATE 0.09 0.72 -0.63 0.96
SINCE JUN 1 1.48 4.61 -3.13 2.70
SINCE JAN 1 10.71 14.64 -3.93 14.90
DEGREE DAYS
HEATING
YESTERDAY 9 11 -2 9
MONTH TO DATE 155 163 -8 159
SINCE JUN 1 828 997 -169 850
SINCE JUL 1 386 459 -73 421
COOLING
YESTERDAY 0 0 0 0
MONTH TO DATE 0 0 0 0
SINCE JUN 1 1 0 1 0
SINCE JAN 1 1 0 1 0
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION W (280)
HIGHEST GUST SPEED 24 HIGHEST GUST DIRECTION W (290)
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 97 2:00 AM
LOWEST 32 11:00 AM
AVERAGE 65
..........................................................
THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 71 83 2020
MINIMUM TEMPERATURE (F) 37 29 2015
SUNRISE AND SUNSET
AUGUST 18 2025........SUNRISE 6:28 AM MDT SUNSET 8:22 PM MDT
AUGUST 19 2025........SUNRISE 6:30 AM MDT SUNSET 8:20 PM MDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$