


Climatological Report (Daily)
Issued by NWS
Issued by NWS
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791 CDUS45 KRIW 150727 CLIP60 CLIMATE REPORT NATIONAL WEATHER SERVICE RIVERTON WY 127 AM MDT FRI AUG 15 2025 ................................... ...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR AUGUST 14 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 78 3:50 PM 84 2003 71 7 59 MINIMUM 39 5:43 AM 29 2005 38 1 35 AVERAGE 59 54 5 47 PRECIPITATION (IN) YESTERDAY 0.00 0.33 2015 0.05 -0.05 0.20 MONTH TO DATE 0.05 0.60 -0.55 0.82 SINCE JUN 1 1.44 4.49 -3.05 2.56 SINCE JAN 1 10.67 14.52 -3.85 14.76 DEGREE DAYS HEATING YESTERDAY 6 10 -4 18 MONTH TO DATE 133 130 3 123 SINCE JUN 1 806 964 -158 814 SINCE JUL 1 364 426 -62 385 COOLING YESTERDAY 0 0 0 0 MONTH TO DATE 0 0 0 0 SINCE JUN 1 1 0 1 0 SINCE JAN 1 1 0 1 0 ................................................................... WIND (MPH) HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION NW (310) HIGHEST GUST SPEED 32 HIGHEST GUST DIRECTION NW (310) AVERAGE WIND SPEED 2.9 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 86 5:00 AM LOWEST 18 2:00 PM AVERAGE 52 .......................................................... THE LAKE YELLOWSTONE WY CLIMATE NORMALS FOR TODAY NORMAL RECORD YEAR MAXIMUM TEMPERATURE (F) 71 81 2003 2023 MINIMUM TEMPERATURE (F) 37 29 2009 SUNRISE AND SUNSET AUGUST 15 2025........SUNRISE 6:25 AM MDT SUNSET 8:26 PM MDT AUGUST 16 2025........SUNRISE 6:26 AM MDT SUNSET 8:25 PM MDT - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. $$