941
CXUS51 KLWX 051938
CLMIAD

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
338 PM EDT MON OCT 05 2026

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 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            100   09/06/2023
 LOW              30   09/24/1974
HIGHEST           94   09/01         91       3       94
LOWEST            50   09/24         39      11       46
AVG. MAXIMUM    80.1               79.3     0.8     81.4
AVG. MINIMUM    62.9               57.9     5.0     59.0
MEAN            71.5               68.6     2.9     70.2
DAYS MAX >= 90     5                3.1     1.9        2
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       11.26   1975
 MINIMUM        0.15   2005
TOTALS          3.80               3.94   -0.14     1.22
DAILY AVG.      0.13               0.13   -0.00     0.04
DAYS >= .01       11                9.0     2.0        7
DAYS >= .10        8                5.9     2.1        4
DAYS >= .50        4                2.5     1.5        1
DAYS >= 1.00       1                1.2    -0.2        0
GREATEST
 24 HR. TOTAL   1.37   09/21 TO 09/22               0.84
 STORM TOTAL    1.15                                0.69
 (MM/DD(HH))

SNOWFALL (INCHES)
RECORDS
 TOTAL            MM   2023
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     21                 45     -24        7
 SINCE 7/1        21                 44     -23       MM
COOLING TOTAL    224                152      72      170
 SINCE 1/1      1504               1208     296       MM
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              6.5
HIGHEST WIND SPEED/DIRECTION    32/330
HIGHEST GUST SPEED/DIRECTION    49/320

SKY COVER
AVERAGE SKY COVER           0.62

AVERAGE RH (PERCENT)     74

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              6     MIXED PRECIP               0
HEAVY RAIN                3     RAIN                       5
LIGHT RAIN               15     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      11     FOG W/VIS <= 1/4 MILE      0
HAZE                      4

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

$$