Climatological Report (Monthly)
Issued by NWS
Issued by NWS
100 CXUS55 KRIW 011740 CLMP60 CLIMATE REPORT NATIONAL WEATHER SERVICE RIVERTON WY 1122 AM MDT TUE OCT 01 2024 ...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LAKE YELLOWSTONE FOR THE MONTH OF SEPTEMBER 2024... ...OFFICIAL CLIMATE DATA FOR THE MONTH OF SEPTEMBER 2024 WILL BE AVAILABLE APPROXIMATELY IN 60 DAYS FROM THE NATIONAL CENTERS FOR ENVIRONMENTAL INFORMATION (HTTP://WWW.NCDC.NOAA.GOV/CDO- WEB/DATASETS). UNOFFICIAL ASOS DAILY SUMMARIES ARE AVAILABLE ON THE INTERNET AT HTTP://WWW.WEATHER.GOV/CLIMATE/INDEX.PHP?WFO=RIW ...LAKE YELLOWSTONE WAS WARMER AND DRIER THAN NORMAL IN SEPTEMBER... AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN SEPTEMBER WAS 48.7 DEGREES WHICH IS 3.3 DEGREES ABOVE NORMAL. IT WAS THE 4TH WARMEST SEPTEMBER SINCE RECORDS BEGAN IN 1998. THE WARMEST READING OF THE MONTH WAS 79 DEGREES ON THE 1ST. THE HIGH ON THE 28TH OF 73 DEGREES TIED THE 2010 RECORD. THE 29TH HIGH OF 72 DEGREES BROKE THE 2010 RECORD OF 70. COLDEST READING OF THE MONTH WAS 26 DEGREES ON THE 22ND. TOTAL PRECIPITATION AT LAKE YELLOWSTONE WAS 1.43 INCHES...WHICH WAS 91 PERCENT OF NORMAL. THE WETTEST 24-HOUR PERIOD DURING THE MONTH WAS THE 17TH WHEN 0.56 INCHES OF PRECIPITATION FELL. NO PRECIPITATION RECORDS WERE BROKEN THIS MONTH. THE HIGHEST WIND GUST WAS 35 MPH FROM THE NORTHWEST ON THE 11TH. ...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2024... CLIMATE NORMAL PERIOD: 1991 TO 2020 CLIMATE RECORD PERIOD: 1998 TO 2024 WEATHER OBSERVED NORMAL DEPART LAST YEAR`S VALUE DATE(S) VALUE FROM VALUE NORMAL .............................................................. TEMPERATURE (F) RECORD HIGH 83 09/07/2022 LOW 13 09/24/2000 HIGHEST 79 09/01 LOWEST 25 09/30 AVG. MAXIMUM 64.8 60.5 4.3 AVG. MINIMUM 32.6 30.3 2.3 MEAN 48.7 45.4 3.3 DAYS MAX >= 90 0 DAYS MAX <= 32 0 DAYS MIN <= 32 16 DAYS MIN <= 0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 4.09 2013 MINIMUM 0.21 2018 TOTALS 1.43 1.57 -0.14 3.62 DAILY AVG. 0.05 0.05 -0.00 DAYS >= .01 6 DAYS >= .10 5 DAYS >= .50 1 DAYS >= 1.00 0 GREATEST 24 HR. TOTAL 0.56 09/17 TO 09/17 STORM TOTAL 0.56 DEGREE DAYS HEATING TOTAL 479 588 -109 SINCE 7/1 1056 1230 -174 COOLING TOTAL 0 0 0 SINCE 1/1 0 0 0 .............................................................. WIND (MPH) AVERAGE WIND SPEED 2.4 RESULTANT WIND SPEED/DIRECTION 0/340 HIGHEST WIND SPEED/DIRECTION 18/280 DATE 09/11 HIGHEST GUST SPEED/DIRECTION 35/290 DATE 09/11 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.00 NUMBER OF DAYS FAIR 30 NUMBER OF DAYS PC 0 NUMBER OF DAYS CLOUDY 0 AVERAGE RH (PERCENT) 62 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 2 MIXED PRECIP 0 HEAVY RAIN 0 RAIN 0 LIGHT RAIN 6 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 SLEET 0 FOG 0 FOG W/VIS <= 1/4 MILE 0 HAZE 0 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. LOOKING AHEAD TO OCTOBER 2024. THE AVERAGE HIGH TEMPERATURE ON THE FIRST OF THE MONTH IS 53 DEGREES...AND THE AVERAGE LOW TEMPERATURE IS 27 DEGREES. THE AVERAGE HIGH BY THE END OF THE MONTH IS 39 DEGREES AND THE AVERAGE LOW TEMPERATURE IS 17 DEGREES. THE AVERAGE MONTHLY PRECIPITATION IS 1.85 INCHES. $$