545
CDUS41 KLWX 172126
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
426 PM EST WED DEC 17 2025
...............................
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 17 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 50 2:41 PM 70 1984 46 4 62
MINIMUM 21 12:58 AM 3 1989 29 -8 34
AVERAGE 36 37 -1 48
PRECIPITATION (IN)
TODAY 0.00 1.91 2023 0.10 -0.10 0.00
MONTH TO DATE 0.87 1.91 -1.04 2.16
SINCE DEC 1 0.87 1.91 -1.04 2.16
SINCE JAN 1 29.75 41.85 -12.10 33.19
SNOWFALL (IN)
TODAY 0.0 4.3 1973 0.1 -0.1 0.0
MONTH TO DATE 2.0 1.4 0.6 T
SINCE DEC 1 2.0 1.4 0.6 T
SINCE JUL 1 2.0 1.7 0.3 T
SNOW DEPTH 0
DEGREE DAYS
HEATING
TODAY 29 28 1 17
MONTH TO DATE 567 439 128 467
SINCE DEC 1 567 439 128 467
SINCE JUL 1 1360 1339 21 1135
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 14 HIGHEST WIND DIRECTION S (200)
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION S (200)
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 75 1:00 AM
LOWEST 44 2:00 PM
AVERAGE 60
......................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 46 76 2006
MINIMUM TEMPERATURE (F) 29 3 1989
SUNRISE AND SUNSET
DECEMBER 17 2025......SUNRISE 7:23 AM EST SUNSET 4:49 PM EST
DECEMBER 18 2025......SUNRISE 7:23 AM EST SUNSET 4:50 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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