Climatological Report (Daily)
Issued by NWS Sterling, VA

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CDUS41 KLWX 150525
CLIIAD


CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1223 AM EST FRI DEC 15 2017


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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 14 2017...

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)
 YESTERDAY
  MAXIMUM         40    916 AM  69    2015  46     -6       45
  MINIMUM         26    744 AM   3    1989  27     -1       30
  AVERAGE         33                        37     -4       38

PRECIPITATION (IN)
  YESTERDAY        0.00          0.96 1999   0.10  -0.10     0.00
  MONTH TO DATE    0.34                      1.49  -1.15     1.48
  SINCE DEC 1      0.34                      1.49  -1.15     1.48
  SINCE JAN 1     40.23                     40.07   0.16    34.45

SNOWFALL (IN)
  YESTERDAY        0.0           3.6  2003   0.2   -0.2
  MONTH TO DATE    4.0                       1.4    2.6
  SINCE JUL 1      4.0                       1.9    2.1
  SNOW DEPTH       0

DEGREE DAYS
 HEATING
  YESTERDAY       32                        28      4       27
  MONTH TO DATE  377                       368      9      350
  SINCE DEC 1    377                       368      9      350
  SINCE JUL 1   1171                      1284   -113     1077

 COOLING
  YESTERDAY        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    32   HIGHEST WIND DIRECTION    NW (300)
  HIGHEST GUST SPEED    39   HIGHEST GUST DIRECTION    NW (300)
  AVERAGE WIND SPEED    11.6


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 0.7


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


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    63           600 AM
 LOWEST     37           200 PM
 AVERAGE    50

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


THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   46        71      1971
 MINIMUM TEMPERATURE (F)   27         5      1989


SUNRISE AND SUNSET
DECEMBER 15 2017......SUNRISE   721 AM EST   SUNSET   449 PM EST
DECEMBER 16 2017......SUNRISE   722 AM EST   SUNSET   449 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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