SEA-TAC, WASHINGTON

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

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DAILY WEATHER AVERAGE - 21 OCTOBER

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	10.6 ^°C	14.2 ^°C	7.9 ^°C	20 ^°C (1998)	2 ^°C (1997)
Dewpoint	8.1 ^°C	9.6 ^°C	5.9 ^°C	16.1 ^°C (2003)	0.6 ^°C (1998)
Humidity	85.4 ^%	96.8 ^%	66.6 ^%		47 ^% (1998)
Barometer	1020 ^hPa	1022.4 ^hPa	1016.6 ^hPa	1036.6 ^hPa (2008)	1008.1 ^hPa (2004)
Wind Speed	10.1 ^km/h	18.8 ^km/h		29.6 ^km/h (2011)
Wind Gust		38.5 ^km/h		42.6 ^km/h (2001)
Precipitation	6.6 ^mm			18.54 ^mm (1996)

Weather Element	Average
Visibility	12.6 ^km
Wind Direction	SSE (142 °)

Weather Element	Total
Heating Degree Days	7.3 (Base 18.3)
Growing Degree Days	2.4 (Base 10)

Total Years on Record: 21

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