Climatological Report (Daily)
Issued by NWS
Issued by NWS
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944
CDUS45 KRIW 190730
CLIP60
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
130 AM MDT SAT SEP 19 2026
...................................
...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR SEPTEMBER 18 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 54 4:35 PM 75 2009 60 -6 66
MINIMUM 41 10:31 PM 18 2003 30 11 29
AVERAGE 48 45 3 48
PRECIPITATION (IN)
YESTERDAY 0.53R 0.53 2013 0.06 0.47 0.00
MONTH TO DATE 1.20 0.91 0.29 1.19
SINCE SEP 1 1.20 0.91 0.29 1.19
SINCE JAN 1 15.12 16.17 -1.05 12.90
DEGREE DAYS
HEATING
YESTERDAY 17 20 -3 17
MONTH TO DATE 296 316 -20 271
SINCE SEP 1 296 316 -20 271
SINCE JUL 1 664 958 -294 787
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 9 HIGHEST WIND DIRECTION W (270)
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION W (260)
AVERAGE WIND SPEED 1.5
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 12:00 AM
LOWEST 63 5:00 PM
AVERAGE 82
..........................................................
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 2026.....SUNRISE 7:05 AM MDT SUNSET 7:24 PM MDT
SEPTEMBER 20 2026.....SUNRISE 7:07 AM MDT SUNSET 7:23 PM MDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$