729
CDUS45 KRIW 190730
CLIP60
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
130 AM MDT FRI SEP 19 2025
...............................
..THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR SEPTEMBER 18 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 66 4:45 PM 75 2009 60 6 46
MINIMUM 29 6:21 AM 18 2003 30 -1 33
AVERAGE 48 45 3 40
PRECIPITATION (IN)
YESTERDAY 0.00 0.53 2013 0.06 -0.06 0.27
MONTH TO DATE 0.90 0.91 -0.01 1.43
SINCE SEP 1 0.90 0.91 -0.01 1.43
SINCE JAN 1 12.61 16.17 -3.56 16.62
DEGREE DAYS
HEATING
YESTERDAY 17 20 -3 25
MONTH TO DATE 253 316 -63 271
SINCE SEP 1 253 316 -63 271
SINCE JUL 1 769 958 -189 848
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 12 HIGHEST WIND DIRECTION W (260)
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION NW (300)
AVERAGE WIND SPEED 2.6
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 4:00 AM
LOWEST 26 4:00 PM
AVERAGE 61
......................................................
THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 59 72 2009
2010
MINIMUM TEMPERATURE (F) 30 22 2003
SUNRISE AND SUNSET
SEPTEMBER 19 2025.....SUNRISE 7:06 AM MDT SUNSET 7:24 PM MDT
SEPTEMBER 20 2025.....SUNRISE 7:07 AM MDT SUNSET 7:22 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