873 CDUS41 KLWX 100533 CLIIAD CLIMATE REPORT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1233 AM EST THU DEC 10 2020 ................................... ...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 9 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 44 4:04 PM 72 1978 48 -4 52 MINIMUM 26 6:33 AM 11 1989 29 -3 36 AVERAGE 35 38 -3 44 PRECIPITATION (IN) YESTERDAY T 1.12 1973 0.11 -0.11 0.52 MONTH TO DATE 0.99 0.98 0.01 0.98 SINCE DEC 1 0.99 0.98 0.01 0.98 SINCE JAN 1 44.64 39.56 5.08 38.82 SNOWFALL (IN) YESTERDAY T 4.0 2017 0.1 -0.1 0.0 MONTH TO DATE T 0.8 -0.8 T SINCE DEC 1 T 0.8 -0.8 T SINCE JUL 1 T 1.3 -1.3 T SNOW DEPTH 0 DEGREE DAYS HEATING YESTERDAY 30 27 3 21 MONTH TO DATE 225 230 -5 233 SINCE DEC 1 225 230 -5 233 SINCE JUL 1 892 1146 -254 1096 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 13 HIGHEST WIND DIRECTION NW (310) HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION NW (300) AVERAGE WIND SPEED 3.2 SKY COVER AVERAGE SKY COVER 0.4 WEATHER CONDITIONS THE FOLLOWING WEATHER WAS RECORDED YESTERDAY. LIGHT SNOW RELATIVE HUMIDITY (PERCENT) HIGHEST 88 10:00 PM LOWEST 45 3:00 PM AVERAGE 67 .......................................................... THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY NORMAL RECORD YEAR MAXIMUM TEMPERATURE (F) 47 70 1966 MINIMUM TEMPERATURE (F) 28 4 1989 SUNRISE AND SUNSET DECEMBER 10 2020......SUNRISE 7:18 AM EST SUNSET 4:48 PM EST DECEMBER 11 2020......SUNRISE 7:19 AM EST SUNSET 4:48 PM EST - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. $$