Climatological Report (Monthly)
Issued by NWS Sterling, VA

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000 CXUS51 KLWX 022339 CLMDCA CLIMATE REPORT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 739 PM EDT TUE MAY 02 2017 ................................... ...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR THE MONTH OF APRIL 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 95 04/17/2002 04/18/1976 04/23/1960 LOW 15 04/01/1923 HIGHEST 91 04/29 86 5 LOWEST 39 04/08 33 6 AVG. MAXIMUM 72.9 66.6 6.3 67.0 AVG. MINIMUM 54.7 47.0 7.7 46.7 MEAN 63.8 56.8 7.0 DAYS MAX >= 90 1 0.3 0.7 DAYS MAX <= 32 0 0.0 0.0 DAYS MIN <= 32 0 0.5 -0.5 DAYS MIN <= 0 0 0.0 0.0 PRECIPITATION (INCHES) RECORD MAXIMUM 9.13 1889 MINIMUM 0.03 1985 TOTALS 2.62 3.06 -0.44 2.05 DAILY AVG. 0.09 0.10 -0.01 DAYS >= .01 10 10.4 -0.4 DAYS >= .10 6 6.5 -0.5 DAYS >= .50 1 2.2 -1.2 DAYS >= 1.00 1 0.6 0.4 GREATEST 24 HR. TOTAL 1.57 04/06 TO 04/06 SNOWFALL (INCHES) RECORDS TOTAL 5.5 1924 TOTALS 0.0 T 0.0 SINCE 7/1 3.4 15.4 -12.0 SNOWDEPTH AVG. 0 DAYS >= TRACE 0 0.1 -0.1 DAYS >= 1.0 0 0.0 0.0 GREATEST SNOW DEPTH 0 MM 24 HR TOTAL 0.0 DEGREE_DAYS HEATING TOTAL 123 270 -147 269 SINCE 7/1 3047 3946 -899 3221 COOLING TOTAL 94 24 70 33 SINCE 1/1 100 26 74 36 .............................................................. WIND (MPH) AVERAGE WIND SPEED 9.3 HIGHEST WIND SPEED/DIRECTION 35/260 DATE 04/06 HIGHEST GUST SPEED/DIRECTION 50/260 DATE 04/06 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.70 NUMBER OF DAYS FAIR 2 NUMBER OF DAYS PC 15 NUMBER OF DAYS CLOUDY 13 AVERAGE RH (PERCENT) 64 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 5 MIXED PRECIP 0 HEAVY RAIN 1 RAIN 4 LIGHT RAIN 15 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 0 SLEET 0 FOG 11 FOG W/VIS <= 1/4 MILE 0 HAZE 3 - 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 RANKED AS THE WARMEST ON RECORD FOR THE MONTH OF APRIL. THE PREVIOUS WARMEST WAS 62.0 DEGREES IN 1994 AND 1981. MONTHLY PRECIPITATION WAS SLIGHTLY BELOW NORMAL. THE MONTHLY AVERAGE HIGH TEMPERATURE WAS 72.9 DEGREES. THIS RANKS AS THE WARMEST ON RECORD...BREAKING THE PREVIOUS RECORD OF 72.8 SET IN 1994...1985 AND 1960. THE MONTHLY AVERAGE LOW TEMPERATURE WAS 54.7 DEGREES. THIS ALSO RANKS AS THE WARMEST ON RECORD...BREAKING THE PREVIOUS RECORD OF 51.9 SET IN 1981. A RECORD DAILY HIGH TEMPERATURE OF 91 DEGREES WAS SET ON THE 29TH. THIS TIED THE RECORD PREVIOUSLY SET IN 1974. THREE RECORD DAILY WARM LOW TEMPERATURES WERE SET LAST MONTH: A LOW OF 65 DEGREES ON THE 16TH TIED THE RECORD SET IN 2002 A LOW OF 64 DEGREES ON THE 21ST TIED THE RECORD SET IN 1896 A LOW OF 70 DEGREES ON THE 29TH BROKE THE RECORD OF 68 SET IN 1956 THE LOW TEMPERATURE OF 70 DEGREES ON THE 29TH WAS ALSO THE WARMEST LOW TEMPERATURE ON RECORD FOR APRIL. 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/RCM

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