430 CDUS41 KLWX 160520 CLIIAD CLIMATE REPORT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1220 AM EST WED DEC 16 2020 ................................... ...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 15 2020... CLIMATE NORMAL PERIOD: 1981 TO 2010 CLIMATE RECORD PERIOD: 1960 TO 2020 WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST VALUE (LST) VALUE VALUE FROM YEAR NORMAL ................................................................... TEMPERATURE (F) YESTERDAY MAXIMUM 41 2:43 PM 71 1971 46 -5 53 MINIMUM 27 11:59 PM 5 1989 27 0 35 AVERAGE 34 36 -2 44 PRECIPITATION (IN) YESTERDAY 0.00 2.49 2018 0.09 -0.09 T MONTH TO DATE 2.23 1.58 0.65 1.81 SINCE DEC 1 2.23 1.58 0.65 1.81 SINCE JAN 1 45.88 40.16 5.72 39.65 SNOWFALL (IN) YESTERDAY 0.0 4.7 1981 0.1 -0.1 T MONTH TO DATE T 1.5 -1.5 0.2 SINCE DEC 1 T 1.5 -1.5 0.2 SINCE JUL 1 T 2.0 -2.0 0.2 SNOW DEPTH 0 DEGREE DAYS HEATING YESTERDAY 31 29 2 21 MONTH TO DATE 353 397 -44 385 SINCE DEC 1 353 397 -44 385 SINCE JUL 1 1020 1313 -293 1248 COOLING YESTERDAY 0 0 0 0 MONTH TO DATE 0 0 0 0 SINCE DEC 1 0 0 0 0 SINCE JAN 1 1406 1178 228 1524 ................................................................... WIND (MPH) HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION NW (320) HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION NW (310) AVERAGE WIND SPEED 6.3 SKY COVER AVERAGE SKY COVER 0.5 WEATHER CONDITIONS THE FOLLOWING WEATHER WAS RECORDED YESTERDAY. NO SIGNIFICANT WEATHER WAS OBSERVED. RELATIVE HUMIDITY (PERCENT) HIGHEST 77 3:00 AM LOWEST 44 11:00 AM AVERAGE 61 .......................................................... THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY NORMAL RECORD YEAR MAXIMUM TEMPERATURE (F) 46 72 1971 MINIMUM TEMPERATURE (F) 27 9 2016 SUNRISE AND SUNSET DECEMBER 16 2020......SUNRISE 7:22 AM EST SUNSET 4:49 PM EST DECEMBER 17 2020......SUNRISE 7:23 AM EST SUNSET 4:49 PM EST - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. $$