National Weather Service Text Product
AFOS product CLIIAD
Dates interpreted at 00:00 UTCDisplaying AFOS PIL: CLIIAD
Product Timestamp: 2025-09-01 06:26 UTC
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433
CDUS41 KLWX 010626
CLIIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
226 AM EDT MON SEP 01 2025
...................................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR AUGUST 31 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 79 4:31 PM 98 1991 84 -5 83
MINIMUM 48 3:51 AM 43 1976 63 -15 69
AVERAGE 64 74 -10 76
PRECIPITATION (IN)
YESTERDAY 0.00 3.21 1975 0.11 -0.11 0.14
MONTH TO DATE 0.85 3.53 -2.68 5.13
SINCE JUN 1 10.72 11.98 -1.26 8.48
SINCE JAN 1 24.64 29.22 -4.58 25.78
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 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
YESTERDAY 1 0 1 0
MONTH TO DATE 2 0 2 2
SINCE JUN 1 17 13 4 2
SINCE JUL 1 2 0 2 2
COOLING
YESTERDAY 0 9 -9 11
MONTH TO DATE 232 334 -102 378
SINCE JUN 1 1030 950 80 1231
SINCE JAN 1 1148 1056 92 1414
...................................................................
WIND (MPH)
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION NE (50)
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION E (90)
AVERAGE WIND SPEED 4.1
SKY COVER
AVERAGE SKY COVER 0.4
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
NO SIGNIFICANT WEATHER WAS OBSERVED.
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 3:00 AM
LOWEST 29 3:00 PM
AVERAGE 63
..........................................................
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 84 98 1962
1980
MINIMUM TEMPERATURE (F) 63 49 1970
1976
SUNRISE AND SUNSET
SEPTEMBER 1 2025.....SUNRISE 6:39 AM EDT SUNSET 7:40 PM EDT
SEPTEMBER 2 2025.....SUNRISE 6:40 AM EDT SUNSET 7:38 PM EDT
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$