Climatological Report (Daily)
Issued by NWS Sterling, VA

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CDUS41 KLWX 120540
CLIDCA


CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1240 AM EST TUE DEC 12 2017


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

...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR DECEMBER 11 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         49    130 PM  68    1979  48      1       43
                                      1971
                                      1897
  MINIMUM         35    756 AM  12    1917  34      1       29
                                      1904
                                      1880
  AVERAGE         42                        41      1       36

PRECIPITATION (IN)
  YESTERDAY        0.00          1.66 2008   0.11  -0.11     0.00
  MONTH TO DATE    0.28                      1.19  -0.91     1.40
  SINCE DEC 1      0.28                      1.19  -0.91     1.40
  SINCE JAN 1     35.38                     37.88  -2.50    30.49

SNOWFALL (IN)
  YESTERDAY        0.0           6.8  1960   0.1   -0.1
  MONTH TO DATE    2.0                       0.7    1.3
  SINCE JUL 1      2.0                       1.2    0.8
  SNOW DEPTH       0

DEGREE DAYS
 HEATING
  YESTERDAY       23                        24     -1       29
  MONTH TO DATE  224                       249    -25      236
  SINCE DEC 1    224                       249    -25      236
  SINCE JUL 1    773                       944   -171      723

 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    17   HIGHEST WIND DIRECTION     S (180)
  HIGHEST GUST SPEED    20   HIGHEST GUST DIRECTION     S (170)
  AVERAGE WIND SPEED     7.2


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 0.6


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


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    75           400 AM
 LOWEST     39           100 PM
 AVERAGE    57

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


THE WASHINGTON NATIONAL DC CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   48        71      1873
 MINIMUM TEMPERATURE (F)   33        13      1988
                                             1957


SUNRISE AND SUNSET
DECEMBER 12 2017......SUNRISE   717 AM EST   SUNSET   447 PM EST
DECEMBER 13 2017......SUNRISE   718 AM EST   SUNSET   447 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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