


Climatological Report (Daily)
Issued by NWS
Issued by NWS
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029 CDUS45 KRIW 090731 CLIP60 CLIMATE REPORT NATIONAL WEATHER SERVICE RIVERTON WY 131 AM MDT THU OCT 09 2025 ................................... ...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR OCTOBER 8 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 58 2:26 PM 65 2020 49 9 65 2024 MINIMUM 25 7:02 AM 7 2009 25 0 26 AVERAGE 42 37 5 46 PRECIPITATION (IN) YESTERDAY 0.00 0.10 2009 0.06 -0.06 0.00 MONTH TO DATE 0.96 0.44 0.52 0.00 SINCE SEP 1 2.42 2.01 0.41 1.43 SINCE JAN 1 14.13 17.27 -3.14 16.62 DEGREE DAYS HEATING YESTERDAY 23 28 -5 19 MONTH TO DATE 196 213 -17 162 SINCE SEP 1 680 801 -121 641 SINCE JUL 1 1196 1443 -247 1218 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 10 HIGHEST WIND DIRECTION W (260) HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION W (260) AVERAGE WIND SPEED 2.1 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 5:00 AM LOWEST 25 3:00 PM AVERAGE 63 .......................................................... THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY NORMAL RECORD YEAR MAXIMUM TEMPERATURE (F) 49 66 2024 MINIMUM TEMPERATURE (F) 24 3 2009 SUNRISE AND SUNSET OCTOBER 9 2025.......SUNRISE 7:30 AM MDT SUNSET 6:47 PM MDT OCTOBER 10 2025.......SUNRISE 7:31 AM MDT SUNSET 6:45 PM MDT - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. $$