347
CDUS46 KSEW 170927
CLISEA
CLIMATE REPORT
NATIONAL WEATHER SERVICE SEATTLE
127 AM PST WED DEC 17 2025
...............................
...THE SEATTLE-TACOMA WA AIRPORT CLIMATE SUMMARY FOR DECEMBER 16 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 55 109 PM 57 1974 47 8 49
MINIMUM 47 419 AM 10 1964 37 10 39
AVERAGE 51 42 9 44
PRECIPITATION (IN)
YESTERDAY 0.99 1.32 1997 0.18 0.81 0.23
MONTH TO DATE 6.53 2.97 3.56 1.49
SINCE OCT 1 15.94 13.19 2.75 9.39
SINCE JAN 1 32.21 36.59 -4.38 28.17
SNOWFALL (IN)
YESTERDAY 0.0 1.1 1992 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 14 23 -9 21
MONTH TO DATE 255 361 -106 376
SINCE DEC 1 255 361 -106 376
SINCE JUL 1 1169 1422 -253 1417
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 (180)
HIGHEST WIND SPEED 29 HIGHEST WIND DIRECTION S (190)
HIGHEST GUST SPEED 40 HIGHEST GUST DIRECTION S (190)
AVERAGE WIND SPEED 12.2
SKY COVER
AVERAGE SKY COVER 1.0
WEATHER CONDITIONS
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
RAIN
LIGHT RAIN
FOG
RELATIVE HUMIDITY (PERCENT)
HIGHEST 97 100 AM
LOWEST 80 1200 PM
AVERAGE 89
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THE SEATTLE-TACOMA WA AIRPORT CLIMATE NORMALS FOR TODAY
NORMAL RECORD YEAR
MAXIMUM TEMPERATURE (F) 47 57 1994
MINIMUM TEMPERATURE (F) 37 11 1964
SUNRISE AND SUNSET
DECEMBER 17 2025......SUNRISE 752 AM PST SUNSET 419 PM PST
DECEMBER 18 2025......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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