Climatological Report (Daily)
Issued by NWS Sterling, VA

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CDUS41 KLWX 160528
CLIIAD


CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1225 AM EST SAT DEC 16 2017


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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 15 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         29   1222 PM  71    1971  46    -17       34
  MINIMUM         20    755 PM   5    1989  27     -7       11
  AVERAGE         25                        36    -11       23

PRECIPITATION (IN)
  YESTERDAY        0.02          1.07 2005   0.09  -0.07     0.00
  MONTH TO DATE    0.36                      1.58  -1.22     1.48
  SINCE DEC 1      0.36                      1.58  -1.22     1.48
  SINCE JAN 1     40.25                     40.16   0.09    34.45

SNOWFALL (IN)
  YESTERDAY        0.2           4.7  1981   0.1    0.1
  MONTH TO DATE    4.2                       1.5    2.7
  SINCE JUL 1      4.2                       2.0    2.2
  SNOW DEPTH       0

DEGREE DAYS
 HEATING
  YESTERDAY       40                        29     11       42
  MONTH TO DATE  417                       397     20      392
  SINCE DEC 1    417                       397     20      392
  SINCE JUL 1   1211                      1313   -102     1119

 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     9   HIGHEST WIND DIRECTION    SW (210)
  HIGHEST GUST SPEED    12   HIGHEST GUST DIRECTION    SW (210)
  AVERAGE WIND SPEED     3.4


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 0.8


WEATHER CONDITIONS
 THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
  SNOW
  LIGHT SNOW
  FOG
  HAZE


RELATIVE HUMIDITY (PERCENT)
 HIGHEST   100           900 PM
 LOWEST     50          1200 AM
 AVERAGE    75

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


THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   46        72      1971
 MINIMUM TEMPERATURE (F)   27         9      2016


SUNRISE AND SUNSET
DECEMBER 16 2017......SUNRISE   722 AM EST   SUNSET   449 PM EST
DECEMBER 17 2017......SUNRISE   723 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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