Climatological Report (Daily)
Issued by NWS Sterling, VA

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CDUS41 KLWX 130521
CLIDCA


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


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

...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR DECEMBER 12 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    146 PM  71    1873  48      1       56
  MINIMUM         25   1159 PM  13    1988  33     -8       41
                                      1957
  AVERAGE         37                        40     -3       49

PRECIPITATION (IN)
  YESTERDAY        0.00          1.36 1959   0.11  -0.11     0.16
  MONTH TO DATE    0.28                      1.30  -1.02     1.56
  SINCE DEC 1      0.28                      1.30  -1.02     1.56
  SINCE JAN 1     35.38                     37.99  -2.61    30.65

SNOWFALL (IN)
  YESTERDAY        0.0           6.6  1982   0.0    0.0
  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       28                        25      3       16
  MONTH TO DATE  252                       274    -22      252
  SINCE DEC 1    252                       274    -22      252
  SINCE JUL 1    801                       969   -168      739

 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    30   HIGHEST WIND DIRECTION    NW (320)
  HIGHEST GUST SPEED    39   HIGHEST GUST DIRECTION    NW (310)
  AVERAGE WIND SPEED    13.4


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 0.9


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


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    73           100 AM
 LOWEST     33          1100 PM
 AVERAGE    53

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


THE WASHINGTON NATIONAL DC CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   47        71      2015
                                             1889
 MINIMUM TEMPERATURE (F)   33        11      1960


SUNRISE AND SUNSET
DECEMBER 13 2017......SUNRISE   718 AM EST   SUNSET   447 PM EST
DECEMBER 14 2017......SUNRISE   719 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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