Climatological Report (Daily)
Issued by NWS Sterling, VA

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CDUS41 KLWX 170534
CLIDCA


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


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

...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR DECEMBER 16 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2017


WEATHER ITEM   OBSERVED TIME   RECORD YEAR NORMAL DEPARTURE LAST
                VALUE   (LST)  VALUE       VALUE  FROM      YEAR
                                                  NORMAL
..................................................................
TEMPERATURE (F)
 YESTERDAY
  MAXIMUM         48    256 PM  74    1971  46      2       30
  MINIMUM         25   1208 AM  10    1917  32     -7       17
  AVERAGE         37                        39     -2       24

PRECIPITATION (IN)
  YESTERDAY        0.00          1.19 1902   0.09  -0.09     0.00
  MONTH TO DATE    0.29                      1.68  -1.39     1.56
  SINCE DEC 1      0.29                      1.68  -1.39     1.56
  SINCE JAN 1     35.39                     38.37  -2.98    30.65

SNOWFALL (IN)
  YESTERDAY        0.0           6.0  1973   0.0    0.0
  MONTH TO DATE    1.7                       1.0    0.7
  SINCE JUL 1      1.7                       1.5    0.2
  SNOW DEPTH       0

DEGREE DAYS
 HEATING
  YESTERDAY       28                        26      2       41
  MONTH TO DATE  379                       375      4      372
  SINCE DEC 1    379                       375      4      372
  SINCE JUL 1    928                      1070   -142      859

 COOLING
  YESTERDAY        0                         0      0        0
  MONTH TO DATE    0                         0      0        0
  SINCE DEC 1      0                         0      0        0
  SINCE JAN 1   1826                      1549    277     1994
..................................................................


WIND (MPH)
  HIGHEST WIND SPEED    21   HIGHEST WIND DIRECTION     S (200)
  HIGHEST GUST SPEED    26   HIGHEST GUST DIRECTION    SW (210)
  AVERAGE WIND SPEED     8.8


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 0.3


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


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    84          1200 AM
 LOWEST     38           100 PM
 AVERAGE    61

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


THE WASHINGTON NATIONAL DC CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   46        64      1984
                                             1939
 MINIMUM TEMPERATURE (F)   32        10      1876


SUNRISE AND SUNSET
DECEMBER 17 2017......SUNRISE   721 AM EST   SUNSET   448 PM EST
DECEMBER 18 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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