730
CDUS41 KLWX 180636
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
236 AM EDT FRI SEP 18 2026
...............................
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 17 2026
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1960 TO 2026
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...............................................................
TEMPERATURE (F)
YESTERDAY
MAXIMUM 87 12:40 PM 97 1991 79 8 68
MINIMUM MM MM 35 1986 58 MM 59
AVERAGE MM 68 MM 64
PRECIPITATION (IN)
YESTERDAY 0.14 1.71 2004 0.14 0.00 0.18
MONTH TO DATE 1.56 2.18 -0.62 1.05
SINCE SEP 1 1.56 2.18 -0.62 1.05
SINCE JAN 1 30.96 31.40 -0.44 25.69
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 MM 1 MM 1
MONTH TO DATE 0 8 -8 7
SINCE SEP 1 0 8 -8 7
SINCE JUL 1 0 9 -9 9
COOLING
YESTERDAY MM 5 MM 0
MONTH TO DATE 169 112 57 71
SINCE SEP 1 169 112 57 71
SINCE JAN 1 1449 1168 281 1219
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WIND (MPH)
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION N (350)
HIGHEST GUST SPEED 24 HIGHEST GUST DIRECTION N (350)
AVERAGE WIND SPEED 4.3
SKY COVER
AVERAGE SKY COVER 0.7
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
THUNDERSTORM
RAIN
LIGHT RAIN
FOG
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 8:00 PM
LOWEST 61 12:00 PM
AVERAGE 79
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THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 79 91 1978
MINIMUM TEMPERATURE (F) 57 37 1990
SUNRISE AND SUNSET
SEPTEMBER 18 2026.....SUNRISE 6:54 AM EDT SUNSET 7:13 PM EDT
SEPTEMBER 19 2026.....SUNRISE 6:55 AM EDT SUNSET 7:12 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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