Climatological Report (Monthly)
Issued by NWS
Issued by NWS
000 CXUS55 KRIW 021638 CLMP60 CLIMATE REPORT NATIONAL WEATHER SERVICE RIVERTON WY 1021 AM MDT MON OCT 02 2023 ...PRELIMINARY MONTHLY CLIMATE SUMMARY FOR LAKE YELLOWSTONE FOR THE MONTH OF SEPTEMBER 2023... ...OFFICIAL CLIMATE DATA FOR THE MONTH OF SEPTEMBER 2023 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 WETTER IN SEPTEMBER... AVERAGE TEMPERATURE FOR LAKE YELLOWSTONE IN SEPTEMBER WAS 47.1 DEGREES WHICH IS 1.7 DEGREES ABOVE NORMAL. THE WARMEST READING OF THE MONTH WAS 71 DEGREES ON THE 1ST. THE COLDEST READING OF THE MONTH WAS ON THE 29TH WITH 26 DEGREES. NO TEMPERATURE RECORDS WERE BROKEN. TOTAL PRECIPITATION AT LAKE YELLOWSTONE WAS 3.62 INCHES... WHICH WAS 231 PERCENT OF NORMAL. IT WAS THE 2ND WETTEST SEPTEMBER ON RECORD. THE WETTEST 24-HOUR PERIOD DURING THE MONTH WAS THE 20TH- 21ST WHEN 1.57 INCHES OF PRECIPITATION FELL. THE 21ST HAD 1.20 INCHES AND BROKE THE 2006 RECORD OF 0.43. THE 3RD HAD 0.84 AND BROKE THE 2004 RECORD OF 0.29. THE 13TH HAD 0.68 INCHES AND BROKE 0.27 FROM 2017. THE HIGHEST WIND GUST WAS 32 MPH FROM THE SOUTHWEST ON THE 1ST. ...THE LAKE YELLOWSTONE WY CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2023... CLIMATE NORMAL PERIOD: 1991 TO 2020 CLIMATE RECORD PERIOD: 1998 TO 2023 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 71 09/01 LOWEST 26 09/29 AVG. MAXIMUM 61.3 60.5 0.8 AVG. MINIMUM 32.9 30.3 2.6 MEAN 47.1 45.4 1.7 DAYS MAX >= 90 0 DAYS MAX <= 32 0 DAYS MIN <= 32 14 DAYS MIN <= 0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 4.09 2013 MINIMUM 0.21 2018 TOTALS 3.62 1.57 2.05 1.62 DAILY AVG. 0.12 0.05 0.07 DAYS >= .01 10 DAYS >= .10 7 DAYS >= .50 3 DAYS >= 1.00 1 GREATEST 24 HR. TOTAL 1.57 09/20 TO 09/21 STORM TOTAL 1.20 DEGREE DAYS HEATING TOTAL 496 588 -92 SINCE 7/1 1029 1230 -201 COOLING TOTAL 0 0 0 SINCE 1/1 0 0 0 .............................................................. WIND (MPH) AVERAGE WIND SPEED 1.9 RESULTANT WIND SPEED/DIRECTION 0/070 HIGHEST WIND SPEED/DIRECTION 17/280 DATE 09/08 HIGHEST GUST SPEED/DIRECTION 32/200 DATE 09/01 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.00 NUMBER OF DAYS FAIR 28 NUMBER OF DAYS PC 0 NUMBER OF DAYS CLOUDY 0 AVERAGE RH (PERCENT) 69 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 2 MIXED PRECIP 0 HEAVY RAIN 1 RAIN 5 LIGHT RAIN 10 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 2023...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. $$