546
CDUS41 KLWX 180730
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
230 AM EST THU DEC 18 2025
...............................
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 17 2025
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)
YESTERDAY
MAXIMUM 50 4:07 PM 70 1984 46 4 62
MINIMUM 21 12:58 AM 3 1989 29 -8 34
AVERAGE 36 37 -1 48
PRECIPITATION (IN)
YESTERDAY 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)
YESTERDAY 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
YESTERDAY 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
YESTERDAY 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
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WIND (MPH)
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION S (200)
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION S (200)
AVERAGE WIND SPEED 4.5
SKY COVER
AVERAGE SKY COVER 0.6
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 78 10:00 PM
LOWEST 44 2:00 PM
AVERAGE 61
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THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 46 76 2006
MINIMUM TEMPERATURE (F) 29 3 1989
SUNRISE AND SUNSET
DECEMBER 18 2025......SUNRISE 7:23 AM EST SUNSET 4:50 PM EST
DECEMBER 19 2025......SUNRISE 7:24 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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