Climatological Report (Daily)
Issued by NWS
Issued by NWS
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CDUS45 KRIW 210732
CLIP60
CLIMATE REPORT
NATIONAL WEATHER SERVICE RIVERTON WY
132 AM MDT MON SEP 21 2026
...................................
...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR SEPTEMBER 20 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 51 5:25 PM 69 2012 59 -8 69
2016
2025
MINIMUM 32 11:59 PM 20 2000 29 3 31
AVERAGE 42 44 -2 50
PRECIPITATION (IN)
YESTERDAY 0.00 0.60 2019 0.06 -0.06 0.00
MONTH TO DATE 1.51 1.02 0.49 1.19
SINCE SEP 1 1.51 1.02 0.49 1.19
SINCE JAN 1 15.43 16.28 -0.85 12.90
DEGREE DAYS
HEATING
YESTERDAY 23 21 2 15
MONTH TO DATE 319 358 -39 304
SINCE SEP 1 319 358 -39 304
SINCE JUL 1 687 1000 -313 820
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 7 HIGHEST WIND DIRECTION W (290)
HIGHEST GUST SPEED 11 HIGHEST GUST DIRECTION NW (300)
AVERAGE WIND SPEED 1.4
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 6:00 AM
LOWEST 65 2:00 PM
AVERAGE 83
..........................................................
THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 58 69 2001
2012
MINIMUM TEMPERATURE (F) 29 22 2004
2021
SUNRISE AND SUNSET
SEPTEMBER 21 2026.....SUNRISE 7:08 AM MDT SUNSET 7:21 PM MDT
SEPTEMBER 22 2026.....SUNRISE 7:09 AM MDT SUNSET 7:19 PM MDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$