184
CDUS41 KLWX 172140
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
540 PM EDT WED SEP 17 2025
...............................
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 17 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 67 3:59 PM 97 1991 79 -12 79
MINIMUM 59 4:21 AM 35 1986 58 1 66
AVERAGE 63 68 -5 73
PRECIPITATION (IN)
TODAY 0.15 1.71 2004 0.14 0.01 0.08
MONTH TO DATE 1.02 2.18 -1.16 0.08
SINCE SEP 1 1.02 2.18 -1.16 0.08
SINCE JAN 1 25.66 31.40 -5.74 25.86
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 2 1 1 0
MONTH TO DATE 8 8 0 11
SINCE SEP 1 8 8 0 11
SINCE JUL 1 10 9 1 13
COOLING
TODAY 0 5 -5 8
MONTH TO DATE 71 112 -41 61
SINCE SEP 1 71 112 -41 61
SINCE JAN 1 1219 1168 51 1475
...............................................................
WIND (MPH)
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION N (350)
HIGHEST GUST SPEED 24 HIGHEST GUST DIRECTION N (350)
AVERAGE WIND SPEED 11.7
SKY COVER
AVERAGE SKY COVER 1.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 3:00 PM
LOWEST 83 1:00 AM
AVERAGE 90
......................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 79 91 1978
MINIMUM TEMPERATURE (F) 57 37 1990
SUNRISE AND SUNSET
SEPTEMBER 17 2025.....SUNRISE 6:53 AM EDT SUNSET 7:14 PM EDT
SEPTEMBER 18 2025.....SUNRISE 6:54 AM EDT SUNSET 7:13 PM EDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page