914 CDUS41 KLWX 310522 CLIIAD CLIMATE REPORT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 1222 AM EST THU DEC 31 2020 ................................... ...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 30 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 47 11:59 PM 67 1990 43 4 63 MINIMUM 26 12:08 AM 4 1963 25 1 45 AVERAGE 37 34 3 54 PRECIPITATION (IN) YESTERDAY 0.00 0.87 1969 0.08 -0.08 0.18 MONTH TO DATE 5.81 2.89 2.92 2.97 SINCE DEC 1 5.81 2.89 2.92 2.97 SINCE JAN 1 49.46 41.47 7.99 40.81 SNOWFALL (IN) YESTERDAY 0.0 0.9 1977 0.2 -0.2 0.0 MONTH TO DATE 2.4 3.4 -1.0 0.6 SINCE DEC 1 2.4 3.4 -1.0 0.6 SINCE JUL 1 2.4 3.9 -1.5 0.6 SNOW DEPTH 0 DEGREE DAYS HEATING YESTERDAY 28 31 -3 11 MONTH TO DATE 782 851 -69 782 SINCE DEC 1 782 851 -69 782 SINCE JUL 1 1449 1767 -318 1645 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 21 HIGHEST WIND DIRECTION S (200) HIGHEST GUST SPEED 32 HIGHEST GUST DIRECTION S (180) AVERAGE WIND SPEED 10.8 SKY COVER AVERAGE SKY COVER 0.8 WEATHER CONDITIONS THE FOLLOWING WEATHER WAS RECORDED YESTERDAY. NO SIGNIFICANT WEATHER WAS OBSERVED. RELATIVE HUMIDITY (PERCENT) HIGHEST 81 4:00 AM LOWEST 40 3:00 PM AVERAGE 61 .......................................................... THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY NORMAL RECORD YEAR MAXIMUM TEMPERATURE (F) 43 73 1992 MINIMUM TEMPERATURE (F) 24 1 1993 SUNRISE AND SUNSET DECEMBER 31 2020......SUNRISE 7:28 AM EST SUNSET 4:58 PM EST JANUARY 1 2021.......SUNRISE 7:29 AM EST SUNSET 4:59 PM EST - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. $$