619
CDUS45 KRIW 200734
CLIP60
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
134 AM MDT SUN SEP 20 2026
...............................
..THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR SEPTEMBER 19 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 53 MM 72 2009 59 -6 63
2010
MINIMUM MM MM 22 2003 30 MM 30
AVERAGE MM 44 MM 47
PRECIPITATION (IN)
YESTERDAY 0.31 0.94 2021 0.05 0.26 0.00
MONTH TO DATE 1.51 0.96 0.55 1.19
SINCE SEP 1 1.51 0.96 0.55 1.19
SINCE JAN 1 15.43 16.22 -0.79 12.90
DEGREE DAYS
HEATING
YESTERDAY MM 21 MM 18
MONTH TO DATE 296 337 -41 289
SINCE SEP 1 296 337 -41 289
SINCE JUL 1 664 979 -315 805
COOLING
YESTERDAY MM 0 MM 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 7 HIGHEST WIND DIRECTION E (99)
HIGHEST GUST SPEED MM HIGHEST GUST DIRECTION MM
AVERAGE WIND SPEED 1.8
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 2:00 AM
LOWEST 59 4:00 PM
AVERAGE 80
......................................................
THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 59 69 2012
2016
2025
MINIMUM TEMPERATURE (F) 29 20 2000
SUNRISE AND SUNSET
SEPTEMBER 20 2026.....SUNRISE 7:07 AM MDT SUNSET 7:23 PM MDT
SEPTEMBER 21 2026.....SUNRISE 7:08 AM MDT SUNSET 7:21 PM MDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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