Climatological Report (Daily)
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000
CDUS46 KSEW 160837
CLISEA


CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
1237 AM PST SAT DEC 16 2017


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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR DECEMBER 15 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         43    643 PM  63    1980  45     -2       38
  MINIMUM         37    144 AM  19    2008  35      2       32
  AVERAGE         40                        40      0       35

PRECIPITATION (IN)
  YESTERDAY        0.06          1.60 1959   0.16  -0.10      T
  MONTH TO DATE    1.17                      2.70  -1.53     1.63
  SINCE OCT 1     14.60                     12.75   1.85    18.16
  SINCE JAN 1     43.61                     34.84   8.77    42.94

SNOWFALL (IN)
  YESTERDAY        0.0           1.2  1979                    T
  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       25                        25      0       30
  MONTH TO DATE  363                       360      3      400
  SINCE DEC 1    363                       360      3      400
  SINCE JUL 1   1352                      1543   -191     1251

 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   5   RESULTANT WIND DIRECTION   S (170)
  HIGHEST WIND SPEED    13   HIGHEST WIND DIRECTION    SE (150)
  HIGHEST GUST SPEED    16   HIGHEST GUST DIRECTION    SE (150)
  AVERAGE WIND SPEED     5.8


SKY COVER
  AVERAGE SKY COVER 1.0


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


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    96           400 PM
 LOWEST     76           100 AM
 AVERAGE    86

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


THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   45        57      1974
 MINIMUM TEMPERATURE (F)   35        10      1964


SUNRISE AND SUNSET
DECEMBER 16 2017......SUNRISE   751 AM PST   SUNSET   419 PM PST
DECEMBER 17 2017......SUNRISE   752 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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