Climatological Report (Daily)
Issued by NWS Sterling, VA

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CDUS41 KLWX 130521
CLIIAD


CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1221 AM EST WED DEC 13 2017


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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 12 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         46    147 PM  72    1979  47     -1       53
  MINIMUM         22   1159 PM   9    1988  28     -6       40
  AVERAGE         34                        37     -3       47

PRECIPITATION (IN)
  YESTERDAY        T             0.95 1964   0.11  -0.11     0.12
  MONTH TO DATE    0.34                      1.30  -0.96     1.48
  SINCE DEC 1      0.34                      1.30  -0.96     1.48
  SINCE JAN 1     40.23                     39.88   0.35    34.45

SNOWFALL (IN)
  YESTERDAY        T            10.6  1982   0.1   -0.1
  MONTH TO DATE    4.0                       1.1    2.9
  SINCE JUL 1      4.0                       1.6    2.4
  SNOW DEPTH       0

DEGREE DAYS
 HEATING
  YESTERDAY       31                        28      3       18
  MONTH TO DATE  307                       312     -5      297
  SINCE DEC 1    307                       312     -5      297
  SINCE JUL 1   1101                      1228   -127     1024

 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    43   HIGHEST GUST DIRECTION    NW (310)
  AVERAGE WIND SPEED    14.9


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 0.8


WEATHER CONDITIONS
 THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
  LIGHT SNOW


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    82           900 AM
 LOWEST     36          1000 PM
 AVERAGE    59

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


THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   46        73      2015
 MINIMUM TEMPERATURE (F)   28         7      1988


SUNRISE AND SUNSET
DECEMBER 13 2017......SUNRISE   720 AM EST   SUNSET   448 PM EST
DECEMBER 14 2017......SUNRISE   721 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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