Climatological Report (Daily)
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CDUS46 KSEW 110837
CLISEA


CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
1237 AM PST MON DEC 11 2017


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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR DECEMBER 10 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    235 PM  66    2014  46      3       44
  MINIMUM         34   1153 PM  16    2009  36     -2       35
  AVERAGE         42                        41      1       40

PRECIPITATION (IN)
  YESTERDAY        0.00          1.55 1977   0.17  -0.17     0.18
  MONTH TO DATE    1.11                      1.87  -0.76     1.45
  SINCE OCT 1     14.54                     11.92   2.62    17.98
  SINCE JAN 1     43.55                     34.01   9.54    42.76

SNOWFALL (IN)
  YESTERDAY        0.0           2.8  1992                   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       23                        24     -1       25
  MONTH TO DATE  240                       236      4      261
  SINCE DEC 1    240                       236      4      261
  SINCE JUL 1   1229                      1419   -190     1112

 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   6   RESULTANT WIND DIRECTION   N (20)
  HIGHEST WIND SPEED    13   HIGHEST WIND DIRECTION     N (10)
  HIGHEST GUST SPEED    15   HIGHEST GUST DIRECTION     N (20)
  AVERAGE WIND SPEED     6.5


SKY COVER
  AVERAGE SKY COVER 0.4


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


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    82           300 AM
 LOWEST     46           100 PM
 AVERAGE    64

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


THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   46        58      2014
 MINIMUM TEMPERATURE (F)   35        21      2009


SUNRISE AND SUNSET
DECEMBER 11 2017......SUNRISE   747 AM PST   SUNSET   418 PM PST
DECEMBER 12 2017......SUNRISE   748 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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