Climatological Report (Daily)
Issued by NWS Sterling, VA

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CDUS41 KLWX 160528
CLIDCA


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


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

...THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR DECEMBER 15 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         31   1245 PM  71    1971  47    -16       40
  MINIMUM         25   1159 PM   6    1904  33     -8       18
  AVERAGE         28                        40    -12       29

PRECIPITATION (IN)
  YESTERDAY        0.01          1.38 1901   0.10  -0.09     0.00
  MONTH TO DATE    0.29                      1.59  -1.30     1.56
  SINCE DEC 1      0.29                      1.59  -1.30     1.56
  SINCE JAN 1     35.39                     38.28  -2.89    30.65

SNOWFALL (IN)
  YESTERDAY        0.2           4.5  1905   0.1    0.1
  MONTH TO DATE    2.2                       1.0    1.2
  SINCE JUL 1      2.2                       1.5    0.7
  SNOW DEPTH       0

DEGREE DAYS
 HEATING
  YESTERDAY       37                        25     12       36
  MONTH TO DATE  351                       349      2      331
  SINCE DEC 1    351                       349      2      331
  SINCE JUL 1    900                      1044   -144      818

 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    13   HIGHEST WIND DIRECTION    NE (50)
  HIGHEST GUST SPEED    18   HIGHEST GUST DIRECTION    NE (30)
  AVERAGE WIND SPEED     5.6


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 0.8


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


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    92          1000 PM
 LOWEST     43           100 AM
 AVERAGE    68

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


THE WASHINGTON NATIONAL DC CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   46        74      1971
 MINIMUM TEMPERATURE (F)   32        10      1917


SUNRISE AND SUNSET
DECEMBER 16 2017......SUNRISE   720 AM EST   SUNSET   448 PM EST
DECEMBER 17 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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