Climatological Report (Daily)
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000
CDUS46 KSEW 120840
CLISEA


CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
1240 AM PST TUE DEC 12 2017


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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR DECEMBER 11 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         49    227 PM  58    2014  46      3       42
  MINIMUM         29    421 AM  21    2009  35     -6       39
  AVERAGE         39                        41     -2       41

PRECIPITATION (IN)
  YESTERDAY        0.00          1.42 2010   0.17  -0.17     0.09
  MONTH TO DATE    1.11                      2.04  -0.93     1.54
  SINCE OCT 1     14.54                     12.09   2.45    18.07
  SINCE JAN 1     43.55                     34.18   9.37    42.85

SNOWFALL (IN)
  YESTERDAY        0.0           4.2  1972                   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       26                        24      2       24
  MONTH TO DATE  266                       260      6      285
  SINCE DEC 1    266                       260      6      285
  SINCE JUL 1   1255                      1443   -188     1136

 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   4   RESULTANT WIND DIRECTION  SE (150)
  HIGHEST WIND SPEED    12   HIGHEST WIND DIRECTION     E (110)
  HIGHEST GUST SPEED    14   HIGHEST GUST DIRECTION     E (110)
  AVERAGE WIND SPEED     5.1


SKY COVER
  AVERAGE SKY COVER 0.3


WEATHER CONDITIONS
 THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
  FOG
  FOG W/VISIBILITY <= 1/4 MILE


RELATIVE HUMIDITY (PERCENT)
 HIGHEST   100           400 AM
 LOWEST     54           200 PM
 AVERAGE    77

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


THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   46        60      1995
                                             1960
 MINIMUM TEMPERATURE (F)   35        22      1972


SUNRISE AND SUNSET
DECEMBER 12 2017......SUNRISE   748 AM PST   SUNSET   418 PM PST
DECEMBER 13 2017......SUNRISE   749 AM PST   SUNSET   418 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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