367
CDUS41 KLWX 092130
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
430 PM EST TUE DEC 09 2025
...............................
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 9 2025
VALID TODAY AS OF 0400 PM LOCAL TIME.
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1960 TO 2025
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...............................................................
TEMPERATURE (F)
TODAY
MAXIMUM 33 3:32 PM 72 1978 48 -15 59
MINIMUM 13 7:15 AM 11 1989 30 -17 34
AVERAGE 23 39 -16 47
PRECIPITATION (IN)
TODAY 0.00 1.12 1973 0.12 -0.12 0.07
MONTH TO DATE 0.78 1.03 -0.25 0.07
SINCE DEC 1 0.78 1.03 -0.25 0.07
SINCE JAN 1 29.66 40.97 -11.31 31.10
SNOWFALL (IN)
TODAY 0.0 4.0 2017 0.1 -0.1 0.0
MONTH TO DATE 1.3 0.7 0.6 T
SINCE DEC 1 1.3 0.7 0.6 T
SINCE JUL 1 1.3 1.0 0.3 T
SNOW DEPTH 0
DEGREE DAYS
HEATING
TODAY 42 26 16 18
MONTH TO DATE 293 224 69 267
SINCE DEC 1 293 224 69 267
SINCE JUL 1 1086 1124 -38 935
COOLING
TODAY 0 0 0 0
MONTH TO DATE 0 0 0 0
SINCE DEC 1 0 0 0 0
SINCE JAN 1 1330 1231 99 1586
...............................................................
WIND (MPH)
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION S (190)
HIGHEST GUST SPEED 21 HIGHEST GUST DIRECTION S (190)
AVERAGE WIND SPEED 5.1
SKY COVER
AVERAGE SKY COVER 0.6
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 67 7:00 AM
LOWEST 39 1:00 PM
AVERAGE 53
......................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 48 70 1966
MINIMUM TEMPERATURE (F) 30 4 1989
SUNRISE AND SUNSET
DECEMBER 9 2025......SUNRISE 7:17 AM EST SUNSET 4:47 PM EST
DECEMBER 10 2025......SUNRISE 7:18 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.
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