239
CDUS41 KLWX 200630
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
230 AM EDT SAT SEP 20 2025
...............................
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 19 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 89 3:53 PM 93 1977 78 11 82
1978
MINIMUM 56 6:16 AM 36 1984 57 -1 66
AVERAGE 73 68 5 74
PRECIPITATION (IN)
YESTERDAY 0.00 1.26 2000 0.14 -0.14 0.00
MONTH TO DATE 1.05 2.47 -1.42 0.61
SINCE SEP 1 1.05 2.47 -1.42 0.61
SINCE JAN 1 25.69 31.69 -6.00 26.39
SNOWFALL (IN)
YESTERDAY 0.0 MM MM 0.0 0.0 0.0
MONTH TO DATE 0.0 0.0 0.0 0.0
SINCE SEP 1 0.0 0.0 0.0 0.0
SINCE JUL 1 0.0 0.0 0.0 0.0
SNOW DEPTH 0
DEGREE DAYS
HEATING
YESTERDAY 0 2 -2 0
MONTH TO DATE 7 12 -5 11
SINCE SEP 1 7 12 -5 11
SINCE JUL 1 9 13 -4 13
COOLING
YESTERDAY 8 4 4 9
MONTH TO DATE 88 120 -32 76
SINCE SEP 1 88 120 -32 76
SINCE JAN 1 1236 1176 60 1490
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WIND (MPH)
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION NW (300)
HIGHEST GUST SPEED 16 HIGHEST GUST DIRECTION NW (320)
AVERAGE WIND SPEED 2.3
SKY COVER
AVERAGE SKY COVER 0.2
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 1:00 AM
LOWEST 33 2:00 PM
AVERAGE 67
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THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 78 91 1965
MINIMUM TEMPERATURE (F) 56 40 1979
SUNRISE AND SUNSET
SEPTEMBER 20 2025.....SUNRISE 6:56 AM EDT SUNSET 7:10 PM EDT
SEPTEMBER 21 2025.....SUNRISE 6:57 AM EDT SUNSET 7:08 PM EDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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