Climatological Report (Monthly)
Issued by NWS Sterling, VA

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000 CXUS51 KLWX 091437 CCA CLMDCA CLIMATE REPORT...CORRECTED NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1037 AM EDT THU OCT 9 2014 ................................... ...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2014... CLIMATE NORMAL PERIOD 1981 TO 2010 CLIMATE RECORD PERIOD 1871 TO 2014 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 95 09/06 92 3 09/02 09/01 LOWEST 54 09/23 48 6 AVG. MAXIMUM 81.8 79.5 2.3 MM AVG. MINIMUM 65.8 62.4 3.4 MM MEAN 73.8 71.0 2.8 DAYS MAX >= 90 6 2.4 3.6 DAYS MAX <= 32 0 0.0 0.0 DAYS MIN <= 32 0 0.0 0.0 DAYS MIN <= 0 0 0.0 0.0 PRECIPITATION (INCHES) RECORD MAXIMUM 17.45 1934 MINIMUM 0.11 2005 TOTALS 1.11 3.72 -2.61 MM DAILY AVG. 0.04 0.12 -0.08 DAYS >= .01 6 8.3 -2.3 DAYS >= .10 3 5.5 -2.5 DAYS >= .50 1 2.4 -1.4 DAYS >= 1.00 0 1.0 -1.0 GREATEST 24 HR. TOTAL 0.68 09/24 TO 09/25 DEGREE_DAYS HEATING TOTAL 0 24 -24 MM SINCE 7/1 0 24 -24 MM COOLING TOTAL 273 202 71 MM SINCE 1/1 1666 1513 153 MM .............................................................. WIND (MPH) AVERAGE WIND SPEED 7.3 HIGHEST WIND SPEED/DIRECTION 26/320 DATE 09/02 HIGHEST GUST SPEED/DIRECTION 33/330 DATE 09/02 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.60 NUMBER OF DAYS FAIR 2 NUMBER OF DAYS PC 19 NUMBER OF DAYS CLOUDY 9 AVERAGE RH (PERCENT) 62 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 3 MIXED PRECIP 0 HEAVY RAIN 3 RAIN 2 LIGHT RAIN 9 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 SLEET 0 FOG 2 FOG W/VIS <= 1/4 MILE 0 HAZE 8 - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. && WASHINGTON DC...REAGAN NATIONAL AIRPORT... THE MONTHLY AVERAGE TEMPERATURE IN WASHINGTON DC FOR SEPTEMBER 2014 WAS ABOVE NORMAL. PRECIPITATION WAS WELL BELOW NORMAL. TOTAL PRECIPITATION TIED FOR THE 18TH DRIEST SEPTEMBER ON RECORD...TIED WITH SEPTEMBER OF 1895. THERE WERE SIX 90 DEGF DAYS THIS MONTH...MATCHING THE TOTAL OF 90 DEGF DAYS IN SEPTEMBER OF LAST YEAR. ON AVERAGE THERE ARE THREE 90 DEGF DAYS IN SEPTEMBER. THIS IS THE FIRST TIME THERE HAS BEEN AT LEAST TWICE THE NORMAL NUMBER OF 90 DEGF DAYS IN THE MONTH OF SEPTEMBER IN BACK-TO-BACK YEARS SINCE 1930-31. $$ ...CORRECTED FOR AVERAGE MONTHLY MINIMUM TEMPERATURE...

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