Climatological Report (Daily)
Issued by NWS Sterling, VA
Issued by NWS Sterling, VA
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CDUS41 KLWX 312129
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
529 PM EDT THU JUL 31 2025
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JULY 31 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 92 11:58 AM 98 1999 88 4 97
MINIMUM 77 5:31 AM 50 1997 67 10 73
AVERAGE 85 77 8 85
PRECIPITATION (IN)
TODAY 0.00 1.87 1978 0.13 -0.13 T
MONTH TO DATE 2.65 4.15 -1.50 2.66
SINCE JUN 1 9.58 8.45 1.13 3.35
SINCE JAN 1 23.50 25.69 -2.19 20.65
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 JUN 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 0 0 0
MONTH TO DATE 0 0 0 0
SINCE JUN 1 15 13 2 0
SINCE JUL 1 0 0 0 0
COOLING
TODAY 20 12 8 20
MONTH TO DATE 479 378 101 499
SINCE JUN 1 800 616 184 853
SINCE JAN 1 918 722 196 1036
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 24 HIGHEST WIND DIRECTION S (190)
HIGHEST GUST SPEED 35 HIGHEST GUST DIRECTION S (180)
AVERAGE WIND SPEED 6.8
SKY COVER
AVERAGE SKY COVER 0.8
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED TODAY.
THUNDERSTORM
RELATIVE HUMIDITY (PERCENT)
HIGHEST 94 3:00 AM
LOWEST 64 12:00 PM
AVERAGE 79
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 87 100 1980
MINIMUM TEMPERATURE (F) 67 54 1997
SUNRISE AND SUNSET
JULY 31 2025..........SUNRISE 6:10 AM EDT SUNSET 8:22 PM EDT
AUGUST 1 2025........SUNRISE 6:11 AM EDT SUNSET 8:21 PM EDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$