Climatological Report (Daily)
Issued by NWS
Issued by NWS
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109
CDUS45 KRIW 120728
CLIP60
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
128 AM MDT SAT SEP 12 2026
...................................
...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR SEPTEMBER 11 2026...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1998 TO 2026
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...................................................................
TEMPERATURE (F)
YESTERDAY
MAXIMUM 65 4:22 PM 73 2017 63 2 58
2022
MINIMUM 39 11:59 PM 22 2014 31 8 35
AVERAGE 52 47 5 47
PRECIPITATION (IN)
YESTERDAY 0.00 0.37 2019 0.05 -0.05 0.29
MONTH TO DATE 0.33 0.55 -0.22 1.13
SINCE SEP 1 0.33 0.55 -0.22 1.13
SINCE JAN 1 14.25 15.81 -1.56 12.84
DEGREE DAYS
HEATING
YESTERDAY 13 18 -5 18
MONTH TO DATE 169 181 -12 137
SINCE SEP 1 169 181 -12 137
SINCE JUL 1 537 823 -286 653
COOLING
YESTERDAY 0 0 0 0
MONTH TO DATE 0 0 0 0
SINCE SEP 1 0 0 0 0
SINCE JAN 1 2 0 2 1
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION W (250)
HIGHEST GUST SPEED 31 HIGHEST GUST DIRECTION S (200)
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 82 7:00 AM
LOWEST 26 3:00 PM
AVERAGE 54
..........................................................
THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 62 75 2017
MINIMUM TEMPERATURE (F) 31 18 2014
SUNRISE AND SUNSET
SEPTEMBER 12 2026.....SUNRISE 6:57 AM MDT SUNSET 7:38 PM MDT
SEPTEMBER 13 2026.....SUNRISE 6:58 AM MDT SUNSET 7:36 PM MDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$