SEA-TAC, WASHINGTON

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

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DAILY WEATHER AVERAGE - 21 DECEMBER

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	4.9 ^°C	7.3 ^°C	2.6 ^°C	12.8 ^°C (2005)	-7.8 ^°C (1998)
Dewpoint	1.5 ^°C	3.7 ^°C	-0.6 ^°C	9.4 ^°C (2005)	-14.4 ^°C (1995)
Humidity	80.4 ^%	92.3 ^%	66.1 ^%		41 ^% (1995)
Barometer	1015.9 ^hPa	1020.3 ^hPa	1011.2 ^hPa	1039.6 ^hPa (1998)	986.1 ^hPa (2015)
Wind Speed	13.4 ^km/h	23 ^km/h		37 ^km/h (2009)
Wind Gust		41.5 ^km/h		51.8 ^km/h (2009)
Precipitation	10.41 ^mm			49.53 ^mm (2015)

Weather Element	Average
Visibility	15 ^km
Wind Direction	SE (131.7 °)

Weather Element	Total
Heating Degree Days	13.4 (Base 18.3)
Growing Degree Days	1.3 (Base 10)

Total Years on Record: 21

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