069
CDUS45 KRIW 200729
CLIP60
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
129 AM MDT SAT SEP 20 2025
...............................
..THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR SEPTEMBER 19 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 63 4:35 PM 72 2009 59 4 55
2010
MINIMUM 30 6:20 AM 22 2003 30 0 32
AVERAGE 47 44 3 44
PRECIPITATION (IN)
YESTERDAY 0.00 0.94 2021 0.05 -0.05 0.00
MONTH TO DATE 0.90 0.96 -0.06 1.43
SINCE SEP 1 0.90 0.96 -0.06 1.43
SINCE JAN 1 12.61 16.22 -3.61 16.62
DEGREE DAYS
HEATING
YESTERDAY 18 21 -3 21
MONTH TO DATE 271 337 -66 292
SINCE SEP 1 271 337 -66 292
SINCE JUL 1 787 979 -192 869
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 7 HIGHEST WIND DIRECTION SE (120)
HIGHEST GUST SPEED 11 HIGHEST GUST DIRECTION SE (120)
AVERAGE WIND SPEED 1.3
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 31 3:00 PM
AVERAGE 64
......................................................
THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 59 69 2012
2016
MINIMUM TEMPERATURE (F) 29 20 2000
SUNRISE AND SUNSET
SEPTEMBER 20 2025.....SUNRISE 7:07 AM MDT SUNSET 7:22 PM MDT
SEPTEMBER 21 2025.....SUNRISE 7:08 AM MDT SUNSET 7:20 PM MDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page