Climatological Report (Monthly)
Issued by NWS Sterling, VA

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000 CXUS51 KLWX 011439 CLMDCA CLIMATE REPORT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1039 AM EDT FRI OCT 01 2021 ................................... ...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2021... CLIMATE NORMAL PERIOD: 1991 TO 2020 CLIMATE RECORD PERIOD: 1871 TO 2021 WEATHER OBSERVED NORMAL DEPART LAST YEAR`S VALUE DATE(S) VALUE FROM VALUE NORMAL .............................................................. TEMPERATURE (F) RECORD HIGH 104 09/07/1881 LOW 36 09/23/1904 HIGHEST 90 09/13 92 -2 91 09/15 LOWEST 54 09/30 48 6 46 AVG. MAXIMUM 81.7 80.7 1.0 78.0 AVG. MINIMUM 64.7 64.1 0.6 62.4 MEAN 73.2 72.4 0.8 70.2 DAYS MAX >= 90 2 3.6 -1.6 2 DAYS MAX <= 32 0 0.0 0.0 0 DAYS MIN <= 32 0 0.0 0.0 0 DAYS MIN <= 0 0 0.0 0.0 0 PRECIPITATION (INCHES) RECORD MAXIMUM 17.45 1934 MINIMUM 0.11 2005 TOTALS 4.03 3.93 0.10 5.53 DAILY AVG. 0.13 0.13 -0.00 0.18 DAYS >= .01 7 8.7 -1.7 13 DAYS >= .10 5 5.8 -0.8 9 DAYS >= .50 3 2.5 0.5 2 DAYS >= 1.00 2 1.0 1.0 1 GREATEST 24 HR. TOTAL 1.63 09/22 TO 09/23 3.44 STORM TOTAL 1.34 2.88 (MM/DD(HH)) SNOWFALL (INCHES) RECORDS TOTAL MM MM TOTALS 0.0 0.0 0.0 0.0 SINCE 7/1 0.0 0.0 0.0 MM DAYS >= TRACE 0 0.0 0.0 0 DAYS >= 1.0 0 0.0 0.0 0 GREATEST SNOW DEPTH 0 0 DEGREE DAYS HEATING TOTAL 0 16 -16 30 SINCE 7/1 0 14 -14 MM COOLING TOTAL 256 238 18 193 SINCE 1/1 1775 1690 85 MM .............................................................. WIND (MPH) AVERAGE WIND SPEED 7.6 HIGHEST WIND SPEED/DIRECTION 32/170 HIGHEST GUST SPEED/DIRECTION 41/240 41/180 SKY COVER AVERAGE SKY COVER 0.52 AVERAGE RH (PERCENT) 66 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 6 MIXED PRECIP 0 HEAVY RAIN 5 RAIN 4 LIGHT RAIN 10 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 SLEET 0 FOG 8 FOG W/VIS <= 1/4 MILE 0 HAZE 6 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && ..................................................................... WASHINGTON DC...RONALD REAGAN WASHINGTON NATIONAL AIRPORT... THE AVERAGE TEMPERATURE IN SEPTEMBER 2021 WAS SLIGHTLY ABOVE NORMAL. IT WAS THE WARMEST SEPTEMBER SINCE 2019, WHEN THE AVERAGE TEMPERATURE WAS 76.5 DEGREES. TOTAL PRECIPITATION WAS 103 PERCENT OF NORMAL. IT WAS THE DRIEST SEPTEMBER SINCE 2019, WHEN ONLY 0.25 INCHES OF PRECIPITATION FELL. NO DAILY RECORDS WERE SET IN SEPTEMBER 2021. WEATHER RECORDS FOR THE WASHINGTON DC AREA HAVE BEEN RECORDED AT WHAT IS NOW RONALD REAGAN WASHINGTON NATIONAL AIRPORT SINCE 1941. THE OFFICIAL WEATHER RECORD CONSISTS OF THAT DATA BACK TO 1945, AND OBSERVATIONS TAKEN IN DOWNTOWN WASHINGTON FROM 1871 THROUGH 1944. TEMPERATURE RECORDS FOR THE WASHINGTON DC AREA EXTEND BACK TO JANUARY OF 1872, WITH PRECIPITATION RECORDS EXTENDING BACK TO JANUARY OF 1871 AND SNOWFALL RECORDS EXTENDING BACK TO JANUARY OF 1884. ALL CLIMATE DATA ARE CONSIDERED PRELIMINARY UNTIL REVIEWED BY THE NATIONAL CENTERS FOR ENVIRONMENTAL INFORMATION (NCEI). $$ RCM

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