Climatological Report (Monthly)
Issued by NWS Sterling, VA

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201 CXUS51 KLWX 050050 CLMDCA CLIMATE REPORT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 850 PM EDT SUN JUN 4 2017 ................................... ...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR THE MONTH OF MAY 2017... CLIMATE NORMAL PERIOD 1981 TO 2010 CLIMATE RECORD PERIOD 1871 TO 2017 WEATHER OBSERVED NORMAL DEPART LAST YEAR`S VALUE DATE(S) VALUE FROM VALUE NORMAL ............................................................. TEMPERATURE (F) RECORD HIGH 99 05/31/1991 LOW 33 05/11/1906 HIGHEST 93 05/19 90 3 LOWEST 46 05/09 44 2 05/07 AVG. MAXIMUM 73.9 75.4 -1.5 71.3 AVG. MINIMUM 57.1 56.5 0.6 56.5 MEAN 65.5 66.0 -0.5 DAYS MAX >= 90 2 1.1 0.9 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 10.69 1953 MINIMUM 0.41 1939 TOTALS 5.55 3.99 1.56 5.65 DAILY AVG. 0.18 0.13 0.05 DAYS >= .01 15 11.1 3.9 DAYS >= .10 9 7.3 1.7 DAYS >= .50 4 2.9 1.1 DAYS >= 1.00 2 0.9 1.1 GREATEST 24 HR. TOTAL 1.75 05/05 TO 05/05 DEGREE_DAYS HEATING TOTAL 74 79 -5 119 SINCE 7/1 3121 4025 -904 3340 COOLING TOTAL 98 108 -10 92 SINCE 1/1 198 134 64 128 .............................................................. WIND (MPH) AVERAGE WIND SPEED 9.3 HIGHEST WIND SPEED/DIRECTION 31/220 DATE 05/01 HIGHEST GUST SPEED/DIRECTION 40/330 DATE 05/14 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.70 NUMBER OF DAYS FAIR 1 NUMBER OF DAYS PC 13 NUMBER OF DAYS CLOUDY 17 AVERAGE RH (PERCENT) 69 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 9 MIXED PRECIP 0 HEAVY RAIN 3 RAIN 10 LIGHT RAIN 19 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 SLEET 0 FOG 14 FOG W/VIS <= 1/4 MILE 0 HAZE 2 - 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 MONTHLY AVERAGE TEMPERATURE WAS SLIGHTLY BELOW NORMAL. MONTHLY PRECIPITATION WAS ABOVE NORMAL. THIS WAS THE FIRST COOLER THAN NORMAL MONTH SINCE MAY OF 2016, BREAKING A STREAK OF 11 CONSECUTIVE NEAR TO WARMER THAN NORMAL MONTHS. THE HIGH TEMPERATURE OF 93 ON THE 19TH WAS THE WARMEST MAY TEMPERATURE SINCE THE 31ST IN 2011 WHEN THE TEMPERATURE REACHED 98 DEGREES. CLIMATE RECORDS HAVE BEEN KEPT AT RONALD REAGAN WASHINGTON NATIONAL AIRPORT SINCE AUGUST OF 1941. ADDITIONAL TEMPERATURE RECORDS FOR THE WASHINGTON DC AREA OBSERVED DOWNTOWN EXTEND BACK TO JANUARY OF 1872. PRECIPITATION RECORDS EXTEND BACK TO JANUARY OF 1871. SNOWFALL RECORDS BEGAN IN JANUARY OF 1884. ALL CLIMATE DATA ARE CONSIDERED PRELIMINARY UNTIL REVIEWED BY THE NATIONAL CENTERS FOR ENVIRONMENTAL INFORMATION (NCEI). $$ DH/BJL/HSK

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