523
CXUS51 KLWX 010909
CLMIAD
CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
509 AM EDT TUE SEP 01 2026
...............................
...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF AUGUST 2026...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1960 TO 2026
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S
VALUE DATE(S) VALUE FROM VALUE
NORMAL
..........................................................
TEMPERATURE (F)
RECORD
HIGH 104 08/20/1983
LOW 38 08/29/1982
HIGHEST 92 08/10 95 -3 95
LOWEST 56 08/25 50 6 48
AVG. MAXIMUM 86.7 86.3 0.4 82.6
AVG. MINIMUM 68.2 65.2 3.0 61.7
MEAN 77.5 75.7 1.8 72.2
DAYS MAX >= 90 6 9.3 -3.3 3
DAYS MAX <= 32 0 0.0 0.0 0
DAYS MIN <= 32 0 0.0 0.0 0
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 10.71 1984
MINIMUM 0.44 1998
TOTALS 4.85 3.53 1.32 0.85
DAILY AVG. 0.16 0.11 0.05 0.03
DAYS >= .01 13 9.3 3.7 8
DAYS >= .10 10 5.6 4.4 4
DAYS >= .50 3 2.2 0.8 0
DAYS >= 1.00 1 1.1 -0.1 0
GREATEST
24 HR. TOTAL 1.35 08/16 TO 08/16 0.41
STORM TOTAL 1.35 0.27
(MM/DD(HH))
SNOWFALL (INCHES)
RECORDS
TOTAL MM MM
TOTALS 0.0 0.0 0.0 0.0
SINCE 7/1 0.0 0.0 0.0 MM
DAYS >= TRACE 0 0.0 0.0 0
DAYS >= 1.0 0 0.0 0.0 0
GREATEST
SNOW DEPTH 0 0
DEGREE DAYS
HEATING TOTAL 0 1 -1 2
SINCE 7/1 0 0 0 MM
COOLING TOTAL 394 334 60 232
SINCE 1/1 1280 1056 224 MM
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WIND (MPH)
AVERAGE WIND SPEED 5.3
HIGHEST WIND SPEED/DIRECTION 29/330
HIGHEST GUST SPEED/DIRECTION 48/330
SKY COVER
AVERAGE SKY COVER 0.61
AVERAGE RH (PERCENT) 72
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 11 MIXED PRECIP 0
HEAVY RAIN 3 RAIN 8
LIGHT RAIN 16 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 12 FOG W/VIS <= 1/4 MILE 1
HAZE 3
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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