Climatological Report (Daily)
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CDUS46 KSEW 170833
CLISEA


CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
1232 AM PST SUN DEC 17 2017


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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR DECEMBER 16 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         45    342 PM  57    1974  45      0       34
  MINIMUM         37    502 AM  10    1964  35      2       25
  AVERAGE         41                        40      1       30

PRECIPITATION (IN)
  YESTERDAY        0.14          1.32 1997   0.17  -0.03     0.00
  MONTH TO DATE    1.31                      2.87  -1.56     1.63
  SINCE OCT 1     14.74                     12.92   1.82    18.16
  SINCE JAN 1     43.75                     35.01   8.74    42.94

SNOWFALL (IN)
  YESTERDAY        0.0           1.1  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       24                        25     -1       35
  MONTH TO DATE  387                       385      2      435
  SINCE DEC 1    387                       385      2      435
  SINCE JUL 1   1376                      1568   -192     1286

 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  SE (150)
  HIGHEST WIND SPEED    12   HIGHEST WIND DIRECTION     S (170)
  HIGHEST GUST SPEED    14   HIGHEST GUST DIRECTION     S (170)
  AVERAGE WIND SPEED     6.2


SKY COVER
  AVERAGE SKY COVER 0.9


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


RELATIVE HUMIDITY (PERCENT)
 HIGHEST   100           300 AM
 LOWEST     82          1100 AM
 AVERAGE    91

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


THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   45        57      1994
 MINIMUM TEMPERATURE (F)   35        11      1964


SUNRISE AND SUNSET
DECEMBER 17 2017......SUNRISE   752 AM PST   SUNSET   419 PM PST
DECEMBER 18 2017......SUNRISE   752 AM PST   SUNSET   420 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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