Climatological Report (Daily)
Issued by NWS Sterling, VA

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CDUS41 KLWX 212122
CLIIAD


CLIMATE REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
522 PM EDT THU SEP 21 2017


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

...THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR SEPTEMBER 21 2017...
VALID TODAY AS OF 0500 PM LOCAL TIME.

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)
 TODAY
  MAXIMUM         85    358 PM  92    1998  77      8       84
                                      1965
  MINIMUM         60    301 AM  33    1962  54      6       66
  AVERAGE         73                        66      7       75

PRECIPITATION (IN)
  TODAY            0.00          2.59 1979   0.13  -0.13     0.00
  MONTH TO DATE    1.75                      2.74  -0.99     0.40
  SINCE SEP 1      1.75                      2.74  -0.99     0.40
  SINCE JAN 1     34.75                     30.74   4.01    28.40

SNOWFALL (IN)
  TODAY            0.0          MM      MM   0.0    0.0
  MONTH TO DATE    0.0                       0.0    0.0
  SINCE JUL 1      T                         0.0    0.0
  SNOW DEPTH       0

DEGREE DAYS
 HEATING
  TODAY            0                         3     -3        0
  MONTH TO DATE   30                        21      9        0
  SINCE SEP 1     30                        21      9        0
  SINCE JUL 1     31                        23      8        0

 COOLING
  TODAY            8                         3      5       10
  MONTH TO DATE   88                       120    -32      233
  SINCE SEP 1     88                       120    -32      233
  SINCE JAN 1   1149                      1136     13     1496
..................................................................


WIND (MPH)
  HIGHEST WIND SPEED    12   HIGHEST WIND DIRECTION    NE (30)
  HIGHEST GUST SPEED    16   HIGHEST GUST DIRECTION    NE (30)
  AVERAGE WIND SPEED     3.4


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 0.3


WEATHER CONDITIONS
 THE FOLLOWING WEATHER WAS RECORDED TODAY.
  FOG


RELATIVE HUMIDITY (PERCENT)
 HIGHEST   100          1200 AM
 LOWEST     44           200 PM
 AVERAGE    72

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


THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   77        94      2010
                                             1980
                                             1970
 MINIMUM TEMPERATURE (F)   54        35      1962


SUNRISE AND SUNSET
SEPTEMBER 21 2017.....SUNRISE   657 AM EDT   SUNSET   708 PM EDT
SEPTEMBER 22 2017.....SUNRISE   658 AM EDT   SUNSET   706 PM EDT


-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.




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