617 CDUS41 KLWX 120523 CLIIAD CLIMATE REPORT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 123 AM EDT TUE SEP 12 2023 ................................... ...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 11 2023... CLIMATE NORMAL PERIOD: 1991 TO 2020 CLIMATE RECORD PERIOD: 1960 TO 2023 WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST VALUE (LST) VALUE VALUE FROM YEAR NORMAL ................................................................... TEMPERATURE (F) YESTERDAY MAXIMUM 88 3:33 PM 99 1983 81 7 81 MINIMUM 69 11:13 PM 40 1976 60 9 69 AVERAGE 79 70 9 75 PRECIPITATION (IN) YESTERDAY 1.45R 0.72 1987 0.13 1.32 0.57 MONTH TO DATE 2.69 1.35 1.34 2.50 SINCE SEP 1 2.69 1.35 1.34 2.50 SINCE JAN 1 21.91 30.57 -8.66 30.00 SNOWFALL (IN) YESTERDAY 0.0 MM MM 0.0 0.0 0.0 MONTH TO DATE T 0.0 0.0 0.0 SINCE SEP 1 T 0.0 0.0 0.0 SINCE JUL 1 T 0.0 0.0 0.0 SNOW DEPTH 0 DEGREE DAYS HEATING YESTERDAY 0 1 -1 0 MONTH TO DATE 0 2 -2 0 SINCE SEP 1 0 2 -2 0 SINCE JUL 1 0 3 -3 0 COOLING YESTERDAY 14 6 8 10 MONTH TO DATE 165 80 85 111 SINCE SEP 1 165 80 85 111 SINCE JAN 1 1280 1136 144 1289 ................................................................... WIND (MPH) HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION NW (320) HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION NW (310) AVERAGE WIND SPEED 5.9 SKY COVER AVERAGE SKY COVER 0.7 WEATHER CONDITIONS THE FOLLOWING WEATHER WAS RECORDED YESTERDAY. THUNDERSTORM HEAVY RAIN RAIN LIGHT RAIN FOG RELATIVE HUMIDITY (PERCENT) HIGHEST 93 1:00 AM LOWEST 43 5:00 PM AVERAGE 68 .......................................................... THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY NORMAL RECORD YEAR MAXIMUM TEMPERATURE (F) 81 95 1998 2019 MINIMUM TEMPERATURE (F) 60 40 1967 SUNRISE AND SUNSET SEPTEMBER 12 2023.....SUNRISE 6:48 AM EDT SUNSET 7:23 PM EDT SEPTEMBER 13 2023.....SUNRISE 6:49 AM EDT SUNSET 7:22 PM EDT - INDICATES NEGATIVE NUMBERS. R INDICATES RECORD WAS SET OR TIED. MM INDICATES DATA IS MISSING. T INDICATES TRACE AMOUNT. $$