Climatological Report (Daily)
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293
CDUS46 KSEW 201610
CLISEA


CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE WA
910 AM PDT WED SEP 20 2017


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

...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR SEPTEMBER 19 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         64        MM  82    1999  70     -6       68
  MINIMUM         50        MM  40    1957  52     -2       53
  AVERAGE         57                        61     -4       61

PRECIPITATION (IN)
  YESTERDAY        0.04          0.79 1959   0.05  -0.01     0.08
  MONTH TO DATE    0.35                      0.83  -0.48     1.02
  SINCE OCT 1     49.17                     36.82  12.35    49.14
  SINCE JAN 1     28.77                     21.42   7.35    24.75

DEGREE DAYS
 HEATING
  YESTERDAY        8                         5      3        4
  MONTH TO DATE   31                        61    -30       52
  SINCE SEP 1     31                        61    -30       52
  SINCE JUL 1     38                       146   -108       73

 COOLING
  YESTERDAY        0                         1     -1        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   8   RESULTANT WIND DIRECTION   S (200)
  HIGHEST WIND SPEED    17   HIGHEST WIND DIRECTION    SW (230)
  HIGHEST GUST SPEED    27   HIGHEST GUST DIRECTION    SW (230)
  AVERAGE WIND SPEED     8.8


SKY COVER
  AVERAGE SKY COVER 0.8


WEATHER CONDITIONS
 THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
  LIGHT RAIN


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    93           200 AM
 LOWEST     55           500 PM
 AVERAGE    74

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


THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   69        88      1974
 MINIMUM TEMPERATURE (F)   51        40      1949


SUNRISE AND SUNSET
SEPTEMBER 20 2017.....SUNRISE   654 AM PDT   SUNSET   710 PM PDT
SEPTEMBER 21 2017.....SUNRISE   655 AM PDT   SUNSET   708 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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