099
CDUS41 KLWX 210632
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
232 AM EDT SUN SEP 21 2025
...............................
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 20 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 80 12:20 PM 91 1965 78 2 86
MINIMUM 66 7:03 AM 40 1979 56 10 59
AVERAGE 73 67 6 73
PRECIPITATION (IN)
YESTERDAY 0.00 0.87 1966 0.14 -0.14 0.00
MONTH TO DATE 1.05 2.61 -1.56 0.61
SINCE SEP 1 1.05 2.61 -1.56 0.61
SINCE JAN 1 25.69 31.83 -6.14 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 14 -7 11
SINCE SEP 1 7 14 -7 11
SINCE JUL 1 9 15 -6 13
COOLING
YESTERDAY 8 4 4 8
MONTH TO DATE 96 124 -28 84
SINCE SEP 1 96 124 -28 84
SINCE JAN 1 1244 1180 64 1498
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WIND (MPH)
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION E (80)
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION E (80)
AVERAGE WIND SPEED 7.0
SKY COVER
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 87 1:00 AM
LOWEST 50 12:00 PM
AVERAGE 69
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THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 77 92 1965
1998
MINIMUM TEMPERATURE (F) 56 33 1962
SUNRISE AND SUNSET
SEPTEMBER 21 2025.....SUNRISE 6:57 AM EDT SUNSET 7:08 PM EDT
SEPTEMBER 22 2025.....SUNRISE 6:58 AM EDT SUNSET 7:06 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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