Climatological Report (Monthly)
Issued by NWS Sterling, VA
Issued by NWS Sterling, VA
000 CXUS51 KLWX 030002 CLMIAD CLIMATE REPORT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 802 PM EDT MON OCT 02 2023 ................................... ...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2023... CLIMATE NORMAL PERIOD: 1991 TO 2020 CLIMATE RECORD PERIOD: 1960 TO 2023 WEATHER OBSERVED NORMAL DEPART LAST YEAR`S VALUE DATE(S) VALUE FROM VALUE NORMAL .............................................................. TEMPERATURE (F) RECORD HIGH 100 09/06/2023 LOW 30 09/24/1974 HIGHEST 100R 09/06 91 9 90 LOWEST 49 09/16 39 10 41 09/20 AVG. MAXIMUM 82.1 79.3 2.8 80.2 AVG. MINIMUM 60.6 57.9 2.7 58.5 MEAN 71.3 68.6 2.8 69.3 DAYS MAX >= 90 9 3.1 5.9 1 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 11.26 1975 MINIMUM 0.15 2005 TOTALS 6.65 3.94 2.71 3.28 DAILY AVG. 0.22 0.13 0.09 0.11 DAYS >= .01 13 9.0 4.0 8 DAYS >= .10 8 5.9 2.1 6 DAYS >= .50 5 2.5 2.5 3 DAYS >= 1.00 3 1.2 1.8 1 GREATEST 24 HR. TOTAL 2.25 09/23 TO 09/24 1.29 STORM TOTAL 1.51 1.17 (MM/DD(HH)) SNOWFALL (INCHES) RECORDS TOTAL MM MM TOTALS T 0.0 0.0 0.0 SINCE 7/1 T 0.0 0.0 MM DAYS >= TRACE 2 0.0 2.0 0 DAYS >= 1.0 0 0.0 0.0 0 GREATEST SNOW DEPTH 0 0 DEGREE DAYS HEATING TOTAL 16 45 -29 39 SINCE 7/1 16 44 -28 MM COOLING TOTAL 216 152 64 176 SINCE 1/1 1331 1208 123 MM .............................................................. WIND (MPH) AVERAGE WIND SPEED 6.4 HIGHEST WIND SPEED/DIRECTION 37/300 HIGHEST GUST SPEED/DIRECTION 49/290 SKY COVER AVERAGE SKY COVER 0.57 AVERAGE RH (PERCENT) 66 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 5 MIXED PRECIP 0 HEAVY RAIN 5 RAIN 4 LIGHT RAIN 13 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 2 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 SLEET 0 FOG 12 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. && AFTER RECORD HEAT TO BEGIN THE MONTH, SEPTEMBER WOUND UP JUST SHY OF 3 DEGREES ABOVE NORMAL. MULTIPLE THUNDERSTORMS JUST AFTER THE EARLY MONTH HEAT BROKE HELPED PUSH MONTHLY PRECIPITATION WELL ABOVE NORMAL. THE HIGH TEMPERATURE OF 100 ON SEPTEMBER 6TH WAS THE HOTTEST TEMPERATURE EVER RECORDED IN THE MONTH OF SEPTEMBER. $$ DHOF