Climatological Report (Daily)
Issued by NWS Sterling, VA

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CDUS41 KLWX 112139
CLIIAD


CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
439 PM EST MON DEC 11 2017


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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 11 2017...
VALID TODAY AS OF 0400 PM LOCAL TIME.

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1960 TO 2017


WEATHER ITEM   OBSERVED TIME   RECORD YEAR NORMAL DEPARTURE LAST
                VALUE   (LST)  VALUE       VALUE  FROM      YEAR
                                                  NORMAL
..................................................................
TEMPERATURE (F)
 TODAY
  MAXIMUM         48    235 PM  71    1979  47      1       40
  MINIMUM         30    640 AM   3    1968  28      2       22
  AVERAGE         39                        38      1       31

PRECIPITATION (IN)
  TODAY            0.00          1.34 2008   0.10  -0.10     0.00
  MONTH TO DATE    0.34                      1.19  -0.85     1.36
  SINCE DEC 1      0.34                      1.19  -0.85     1.36
  SINCE JAN 1     40.23                     39.77   0.46    34.33

SNOWFALL (IN)
  TODAY            0.0           0.5  1962   0.1   -0.1
  MONTH TO DATE    4.0                       1.0    3.0
  SINCE JUL 1      4.0                       1.5    2.5
  SNOW DEPTH       T

DEGREE DAYS
 HEATING
  TODAY           26                        27     -1       34
  MONTH TO DATE  276                       284     -8      279
  SINCE DEC 1    276                       284     -8      279
  SINCE JUL 1   1070                      1200   -130     1006

 COOLING
  TODAY            0                         0      0        0
  MONTH TO DATE    0                         0      0        0
  SINCE DEC 1      0                         0      0        0
  SINCE JAN 1   1281                      1178    103     1559
..................................................................


WIND (MPH)
  HIGHEST WIND SPEED    12   HIGHEST WIND DIRECTION     S (200)
  HIGHEST GUST SPEED    15   HIGHEST GUST DIRECTION     S (200)
  AVERAGE WIND SPEED     3.9


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 0.7


WEATHER CONDITIONS
 THE FOLLOWING WEATHER WAS RECORDED TODAY.
  NO SIGNIFICANT WEATHER WAS OBSERVED.


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    92           600 AM
 LOWEST     42           100 PM
 AVERAGE    67

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


THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   47        72      1979
 MINIMUM TEMPERATURE (F)   28         9      1988


SUNRISE AND SUNSET
DECEMBER 11 2017......SUNRISE   719 AM EST   SUNSET   448 PM EST
DECEMBER 12 2017......SUNRISE   719 AM EST   SUNSET   448 PM EST


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




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