Climatological Report (Daily)
Issued by NWS Sterling, VA

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CDUS41 KLWX 170534
CLIIAD


CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1230 AM EST SUN DEC 17 2017


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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 16 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    334 PM  72    1971  46      0       27
  MINIMUM         23    754 AM   9    2016  27     -4        9
  AVERAGE         35                        36     -1       18

PRECIPITATION (IN)
  YESTERDAY        0.00          0.99 1974   0.10  -0.10     0.00
  MONTH TO DATE    0.36                      1.68  -1.32     1.48
  SINCE DEC 1      0.36                      1.68  -1.32     1.48
  SINCE JAN 1     40.25                     40.26  -0.01    34.45

SNOWFALL (IN)
  YESTERDAY        0.0           5.2  1973   0.1   -0.1
  MONTH TO DATE    4.2                       1.6    2.6
  SINCE JUL 1      4.2                       2.1    2.1
  SNOW DEPTH       T

DEGREE DAYS
 HEATING
  YESTERDAY       30                        29      1       47
  MONTH TO DATE  447                       426     21      439
  SINCE DEC 1    447                       426     21      439
  SINCE JUL 1   1241                      1342   -101     1166

 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    23   HIGHEST WIND DIRECTION     S (200)
  HIGHEST GUST SPEED    28   HIGHEST GUST DIRECTION     S (200)
  AVERAGE WIND SPEED     7.9


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 0.4


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


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    92           200 AM
 LOWEST     40           100 PM
 AVERAGE    66

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


THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   45        70      1984
 MINIMUM TEMPERATURE (F)   27         3      1989


SUNRISE AND SUNSET
DECEMBER 17 2017......SUNRISE   723 AM EST   SUNSET   449 PM EST
DECEMBER 18 2017......SUNRISE   723 AM EST   SUNSET   450 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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