484
CXUS51 KLWX 082335
CLMIAD

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
635 PM EST WED JAN 08 2025

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2024...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1960 TO 2025

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE
                                          NORMAL
..............................................................
TEMPERATURE (F)
RECORD
 HIGH             79   12/06/1998
 LOW              -4   12/25/1989
HIGHEST           67   12/29         66       1       62
LOWEST            14   12/23         10       4       22
AVG. MAXIMUM    47.4               46.5     0.9     52.7
AVG. MINIMUM    28.7               29.0    -0.3     33.3
MEAN            38.0               37.7     0.3     43.0
DAYS MAX >= 90     0                0.0     0.0        0
DAYS MAX <= 32     0                2.0    -2.0        0
DAYS MIN <= 32    20               21.8    -1.8       15
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        6.74   1969
 MINIMUM        0.32   2007
TOTALS          3.34               3.30    0.04     5.75
DAILY AVG.      0.11               0.11    0.00     0.19
DAYS >= .01       11               10.2     0.8       11
DAYS >= .10        7                6.3     0.7        8
DAYS >= .50        1                2.5    -1.5        4
DAYS >= 1.00       1                0.7     0.3        2
GREATEST
 24 HR. TOTAL   1.52   12/10 TO 12/11               2.27
 STORM TOTAL    1.51                                1.91
 (MM/DD(HH))

SNOWFALL (INCHES)
RECORDS
 TOTAL          24.2   1966
TOTALS           0.1                2.8    -2.7      0.5
SINCE 7/1        0.1                3.1    -3.0       MM
DAYS >= TRACE      5                1.6     3.4        1
DAYS >= 1.0        0                0.9    -0.9        0
GREATEST
 SNOW DEPTH       MM                                  MM

DEGREE DAYS
HEATING TOTAL    829                845     -16      675
 SINCE 7/1      1497               1746    -249       MM
COOLING TOTAL      0                  0       0        0
 SINCE 1/1      1586               1231     355       MM
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              6.8
HIGHEST WIND SPEED/DIRECTION    35/290
HIGHEST GUST SPEED/DIRECTION    49/300

SKY COVER
AVERAGE SKY COVER           0.64

AVERAGE RH (PERCENT)     66

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       4
LIGHT RAIN               12     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                4     SLEET                      1
FOG                       8     FOG W/VIS <= 1/4 MILE      2
HAZE                      3

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

$$