Climatological Report (Monthly)
Issued by NWS Sterling, VA

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CXUS51 KLWX 041529
CLMIAD

CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1029 AM EST THU JAN 04 2024

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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2023...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1960 TO 2024

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           62   12/28         66      -4       66
LOWEST            22   12/20         10      12        7
AVG. MAXIMUM    52.7               46.5     6.2     47.2
AVG. MINIMUM    33.3               29.0     4.3     26.6
MEAN            43.0               37.7     5.3     36.9
DAYS MAX >= 90     0                0.0     0.0        0
DAYS MAX <= 32     0                2.0    -2.0        1
DAYS MIN <= 32    15               21.8    -6.8       23
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        6.74   1969
 MINIMUM        0.32   2007
TOTALS          5.75               3.30    2.45     4.95
DAILY AVG.      0.19               0.11    0.08     0.16
DAYS >= .01       11               10.2     0.8        8
DAYS >= .10        8                6.3     1.7        5
DAYS >= .50        4                2.5     1.5        2
DAYS >= 1.00       2                0.7     1.3        2
GREATEST
 24 HR. TOTAL   2.27   12/17 TO 12/18               2.28
 STORM TOTAL    1.91                                2.14
 (MM/DD(HH))

SNOWFALL (INCHES)
RECORDS
 TOTAL          24.2   1966
TOTALS           0.5                2.8    -2.3        T
SINCE 7/1        0.5                3.1    -2.6       MM
DAYS >= TRACE      1                1.6    -0.6        2
DAYS >= 1.0        0                0.9    -0.9        0
GREATEST
 SNOW DEPTH       MM                                   0

DEGREE DAYS
HEATING TOTAL    675                845    -170      862
 SINCE 7/1      1446               1746    -300       MM
COOLING TOTAL      0                  0       0        0
 SINCE 1/1      1380               1231     149       MM
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              5.7
HIGHEST WIND SPEED/DIRECTION    36/290
HIGHEST GUST SPEED/DIRECTION    50/300

SKY COVER
AVERAGE SKY COVER           0.63

AVERAGE RH (PERCENT)     68

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     MIXED PRECIP               0
HEAVY RAIN                4     RAIN                       6
LIGHT RAIN               14     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       1
LIGHT SNOW                1     SLEET                      0
FOG                      14     FOG W/VIS <= 1/4 MILE      4
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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