Climatological Report (Daily)
Issued by NWS
Issued by NWS
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CDUS45 KRIW 150735
CLIP60
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
135 AM MDT TUE SEP 15 2026
...................................
...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR SEPTEMBER 14 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 52 4:44 PM 74 2020 62 -10 63
MINIMUM 28 11:59 PM 22 2003 31 -3 31
AVERAGE 40 46 -6 47
PRECIPITATION (IN)
YESTERDAY 0.02 0.63 2017 0.05 -0.03 0.00
MONTH TO DATE 0.35 0.70 -0.35 1.15
SINCE SEP 1 0.35 0.70 -0.35 1.15
SINCE JAN 1 14.27 15.96 -1.69 12.86
DEGREE DAYS
HEATING
YESTERDAY 25 19 6 18
MONTH TO DATE 224 237 -13 190
SINCE SEP 1 224 237 -13 190
SINCE JUL 1 592 879 -287 706
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 (280)
HIGHEST GUST SPEED 29 HIGHEST GUST DIRECTION SW (240)
AVERAGE WIND SPEED 5.9
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 89 1:00 AM
LOWEST 30 4:00 PM
AVERAGE 60
..........................................................
THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 61 78 2000
MINIMUM TEMPERATURE (F) 31 26 2003
2004
2005
SUNRISE AND SUNSET
SEPTEMBER 15 2026.....SUNRISE 7:01 AM MDT SUNSET 7:32 PM MDT
SEPTEMBER 16 2026.....SUNRISE 7:02 AM MDT SUNSET 7:30 PM MDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$