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. $$