Climatological Report (Daily)
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000
CDUS46 KSEW 210847
CLISEA


CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
147 AM PDT THU SEP 21 2017


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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 20 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         57    241 PM  88    1974  69    -12       67
  MINIMUM         50    835 AM  40    1949  51     -1       49
  AVERAGE         54                        60     -6       58

PRECIPITATION (IN)
  YESTERDAY        0.13          1.05 1972   0.06   0.07     0.00
  MONTH TO DATE    0.48                      0.89  -0.41     1.02
  SINCE OCT 1     49.30                     36.88  12.42    49.14
  SINCE JAN 1     28.90                     21.48   7.42    24.75

DEGREE DAYS
 HEATING
  YESTERDAY       11                         5      6        7
  MONTH TO DATE   42                        66    -24       59
  SINCE SEP 1     42                        66    -24       59
  SINCE JUL 1     49                       151   -102       80

 COOLING
  YESTERDAY        0                         0      0        0
  MONTH TO DATE   67                        19     48        1
  SINCE SEP 1     67                        19     48        1
  SINCE JAN 1    384                       187    197      289
..................................................................


WIND (MPH)
  RESULTANT WIND SPEED   3   RESULTANT WIND DIRECTION   S (190)
  HIGHEST WIND SPEED    14   HIGHEST WIND DIRECTION     S (190)
  HIGHEST GUST SPEED    16   HIGHEST GUST DIRECTION     S (180)
  AVERAGE WIND SPEED     5.1


SKY COVER
  AVERAGE SKY COVER 0.9


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


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    96           700 AM
 LOWEST     72           300 PM
 AVERAGE    84

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


THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   69        88      1974
                                             1952
 MINIMUM TEMPERATURE (F)   51        39      1960
                                             1955


SUNRISE AND SUNSET
SEPTEMBER 21 2017.....SUNRISE   655 AM PDT   SUNSET   708 PM PDT
SEPTEMBER 22 2017.....SUNRISE   656 AM PDT   SUNSET   706 PM PDT


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




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