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
..............................................................

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.

$$