Climatological Report (Daily)
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000
CDUS46 KSEW 150833
CLISEA


CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
1232 AM PST FRI DEC 15 2017


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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR DECEMBER 14 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1945 TO 2017


WEATHER ITEM   OBSERVED TIME   RECORD YEAR NORMAL DEPARTURE LAST
                VALUE   (LST)  VALUE       VALUE  FROM      YEAR
                                                  NORMAL
..................................................................
TEMPERATURE (F)
 YESTERDAY
  MAXIMUM         50    300 PM  59    2002  45      5       39
  MINIMUM         36    216 AM  18    1945  35      1       30
  AVERAGE         43                        40      3       35

PRECIPITATION (IN)
  YESTERDAY        0.00          1.67 1979   0.17  -0.17     0.00
  MONTH TO DATE    1.11                      2.54  -1.43     1.63
  SINCE OCT 1     14.54                     12.59   1.95    18.16
  SINCE JAN 1     43.55                     34.68   8.87    42.94

SNOWFALL (IN)
  YESTERDAY        0.0           0.7  2008                   0.0
  MONTH TO DATE    0.0                                       1.0
  SINCE OCT 1      0.4                                       1.0
  SINCE JUL 1      0.4                                       1.0
  SNOW DEPTH       0

DEGREE DAYS
 HEATING
  YESTERDAY       22                        25     -3       30
  MONTH TO DATE  338                       335      3      370
  SINCE DEC 1    338                       335      3      370
  SINCE JUL 1   1327                      1518   -191     1221

 COOLING
  YESTERDAY        0                         0      0        0
  MONTH TO DATE    0                         0      0        0
  SINCE DEC 1      0                         0      0        0
  SINCE JAN 1    392                       189    203      291
..................................................................


WIND (MPH)
  RESULTANT WIND SPEED   1   RESULTANT WIND DIRECTION  NE (40)
  HIGHEST WIND SPEED    10   HIGHEST WIND DIRECTION    NE (30)
  HIGHEST GUST SPEED    14   HIGHEST GUST DIRECTION    NE (60)
  AVERAGE WIND SPEED     4.6


SKY COVER
  AVERAGE SKY COVER 0.6


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


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    92          1200 AM
 LOWEST     56           300 PM
 AVERAGE    74

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


THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   45        63      1980
 MINIMUM TEMPERATURE (F)   35        19      2008


SUNRISE AND SUNSET
DECEMBER 15 2017......SUNRISE   750 AM PST   SUNSET   419 PM PST
DECEMBER 16 2017......SUNRISE   751 AM PST   SUNSET   419 PM PST


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




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