SEA-TAC, WASHINGTON

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Elevation: 137 meters Latitude: 47 27N Longitude: 122 18W

WEATHER

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DAILY WEATHER AVERAGE - 20 DECEMBER

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	4.9 ^°C	6.9 ^°C	2.7 ^°C	13.3 ^°C (2009)	-9.4 ^°C (2008)
Dewpoint	1.7 ^°C	3.8 ^°C	-0.9 ^°C	11.1 ^°C (2014)	-18.3 ^°C (1998)
Humidity	81.5 ^%	91.8 ^%	67.4 ^%		34 ^% (1998)
Barometer	1015.9 ^hPa	1020.3 ^hPa	1011.2 ^hPa	1039.6 ^hPa (1998)	994.6 ^hPa (2010)
Wind Speed	13.7 ^km/h	25.1 ^km/h		40.7 ^km/h (2014)
Wind Gust		43.6 ^km/h		64.9 ^km/h (2014)
Precipitation	5.84 ^mm			19.05 ^mm (2014)

Weather Element	Average
Visibility	14.8 ^km
Wind Direction	ESE (124.1 °)

Weather Element	Total
Heating Degree Days	13.6 (Base 18.3)
Growing Degree Days	0.5 (Base 10)

Total Years on Record: 20

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