Climatological Report (Monthly)
Issued by NWS Sterling, VA

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071 CXUS51 KLWX 021839 RRA CLMDCA CLIMATE REPORT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 134 PM EST TUE JAN 2 2018 ................................... ...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017... CLIMATE NORMAL PERIOD 1981 TO 2010 CLIMATE RECORD PERIOD 1871 TO 2018 WEATHER OBSERVED NORMAL DEPART LAST YEAR`S VALUE DATE(S) VALUE FROM VALUE NORMAL ............................................................. TEMPERATURE (F) RECORD HIGH 79 12/07/1998 LOW -13 12/31/1880 HIGHEST 65 12/23 66 -1 LOWEST 16 12/31 17 -1 12/28 AVG. MAXIMUM 46.3 46.8 -0.5 49.2 AVG. MINIMUM 32.1 32.5 -0.4 34.4 MEAN 39.2 39.7 -0.5 DAYS MAX >= 90 0 0.0 0.0 DAYS MAX <= 32 4 1.8 2.2 DAYS MIN <= 32 16 14.5 1.5 DAYS MIN <= 0 0 0.0 0.0 PRECIPITATION (INCHES) RECORD MAXIMUM 7.56 1901 MINIMUM 0.19 1889 TOTALS 0.50 3.05 -2.55 2.61 DAILY AVG. 0.02 0.10 -0.08 DAYS >= .01 6 9.7 -3.7 DAYS >= .10 2 5.6 -3.6 DAYS >= .50 0 2.4 -2.4 DAYS >= 1.00 0 0.5 -0.5 GREATEST 24 HR. TOTAL 0.18 12/23 TO 12/23 SNOWFALL (INCHES) RECORDS TOTAL 16.6 2009 TOTALS 1.9 2.3 -0.4 SINCE 7/1 1.9 2.8 -0.9 SNOWDEPTH AVG. 0 DAYS >= TRACE 4 1.5 2.5 DAYS >= 1.0 1 0.7 0.3 GREATEST SNOW DEPTH 2 12/10 24 HR TOTAL 1.5 DEGREE_DAYS HEATING TOTAL 792 786 6 710 SINCE 7/1 1341 1481 -140 1197 COOLING TOTAL 0 0 0 0 SINCE 1/1 1826 1549 277 1994 .............................................................. WIND (MPH) AVERAGE WIND SPEED 8.2 HIGHEST WIND SPEED/DIRECTION 31/310 DATE 12/25 HIGHEST GUST SPEED/DIRECTION 44/300 DATE 12/25 SKY COVER POSSIBLE SUNSHINE (PERCENT) MM AVERAGE SKY COVER 0.70 NUMBER OF DAYS FAIR 3 NUMBER OF DAYS PC 12 NUMBER OF DAYS CLOUDY 16 AVERAGE RH (PERCENT) 60 WEATHER CONDITIONS. NUMBER OF DAYS WITH THUNDERSTORM 0 MIXED PRECIP 0 HEAVY RAIN 1 RAIN 0 LIGHT RAIN 6 FREEZING RAIN 0 LT FREEZING RAIN 0 HAIL 0 HEAVY SNOW 0 SNOW 0 LIGHT SNOW 4 SLEET 0 FOG 7 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... ...5TH DRIEST DECEMBER ON RECORD IN WASHINGTON DC... THE MONTHLY AVERAGE TEMPERATURE WAS 39.2, WHICH IS 0.5 DEGREES BELOW NORMAL. IT WAS THE COLDEST DECEMBER SINCE 2010, WHEN THE AVERAGE TEMPERATURE WAS 34.6. MONTHLY PRECIPITATION WAS 0.50, WHICH IS 2.55 INCHES (84 PERCENT) BELOW NORMAL. THIS MAKES DECEMBER 2017 THE 5TH DRIEST ON RECORD. IT WAS THE DRIEST DECEMBER SINCE 1965, WHEN 0.47 INCHES OF PRECIPITATION FELL. MONTHLY SNOWFALL WAS 1.9 INCHES, WHICH IS 0.4 INCHES BELOW NORMAL. IT WAS THE SNOWIEST DECEMBER SINCE 2010, WHEN 2.1 INCHES FELL. NO DAILY RECORDS WERE SET IN DECEMBER. 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). $$ RCM

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