540
CDUS46 KSEW 160942
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
142 AM PST TUE DEC 16 2025
...............................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR DECEMBER 15 2025...
CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1945 TO 2025
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST
VALUE (LST) VALUE VALUE FROM YEAR
NORMAL
...............................................................
TEMPERATURE (F)
YESTERDAY
MAXIMUM 57 211 PM 63 1980 47 10 47
MINIMUM 47 1016 PM 19 2008 37 10 39
AVERAGE 52 42 10 43
PRECIPITATION (IN)
YESTERDAY 1.00 1.60 1959 0.18 0.82 T
MONTH TO DATE 5.54 2.79 2.75 1.26
SINCE OCT 1 14.95 13.01 1.94 9.16
SINCE JAN 1 31.22 36.41 -5.19 27.94
SNOWFALL (IN)
YESTERDAY 0.0 1.2 1979 0.0
MONTH TO DATE 0.0 0.0
SINCE OCT 1 0.0 0.0
SINCE JUL 1 0.0 0.0
SNOW DEPTH 0
DEGREE DAYS
HEATING
YESTERDAY 13 23 -10 22
MONTH TO DATE 241 338 -97 355
SINCE DEC 1 241 338 -97 355
SINCE JUL 1 1155 1399 -244 1396
COOLING
YESTERDAY 0 0 0 0
MONTH TO DATE 0 0 0 0
SINCE DEC 1 0 0 0 0
SINCE JAN 1 328 263 65 315
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WIND (MPH)
RESULTANT WIND SPEED 11 RESULTANT WIND DIRECTION S (200)
HIGHEST WIND SPEED 25 HIGHEST WIND DIRECTION SW (220)
HIGHEST GUST SPEED 40 HIGHEST GUST DIRECTION S (190)
AVERAGE WIND SPEED 11.6
SKY COVER
AVERAGE SKY COVER 0.9
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
HEAVY RAIN
RAIN
LIGHT RAIN
FOG
HAZE
RELATIVE HUMIDITY (PERCENT)
HIGHEST 100 600 AM
LOWEST 77 700 PM
AVERAGE 89
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THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 47 57 1974
MINIMUM TEMPERATURE (F) 37 10 1964
SUNRISE AND SUNSET
DECEMBER 16 2025......SUNRISE 751 AM PST SUNSET 419 PM PST
DECEMBER 17 2025......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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