490
CDUS41 KLWX 182129
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
529 PM EDT THU SEP 18 2025
...............................
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 18 2025
VALID TODAY AS OF 0500 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 86 3:40 PM 91 1978 79 7 75
MINIMUM 62 6:16 AM 37 1990 57 5 67
AVERAGE 74 68 6 71
PRECIPITATION (IN)
TODAY 0.00 1.76 2003 0.15 -0.15 0.53
MONTH TO DATE 1.05 2.33 -1.28 0.61
SINCE SEP 1 1.05 2.33 -1.28 0.61
SINCE JAN 1 25.69 31.55 -5.86 26.39
SNOWFALL (IN)
TODAY 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
TODAY 0 2 -2 0
MONTH TO DATE 7 10 -3 11
SINCE SEP 1 7 10 -3 11
SINCE JUL 1 9 11 -2 13
COOLING
TODAY 9 4 5 6
MONTH TO DATE 80 116 -36 67
SINCE SEP 1 80 116 -36 67
SINCE JAN 1 1228 1172 56 1481
...............................................................
WIND (MPH)
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION NW (320)
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION NW (310)
AVERAGE WIND SPEED 4.6
SKY COVER
AVERAGE SKY COVER 0.6
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 93 12:00 AM
LOWEST 37 3:00 PM
AVERAGE 65
......................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 78 93 1977
1978
MINIMUM TEMPERATURE (F) 57 36 1984
SUNRISE AND SUNSET
SEPTEMBER 18 2025.....SUNRISE 6:54 AM EDT SUNSET 7:13 PM EDT
SEPTEMBER 19 2025.....SUNRISE 6:55 AM EDT SUNSET 7:11 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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