SEA-TAC, WASHINGTON

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

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DAILY WEATHER AVERAGE - 17 SEPTEMBER

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	14.9 ^°C	18.9 ^°C	12.1 ^°C	26.7 ^°C (2012)	8.3 ^°C (2003)
Dewpoint	11.2 ^°C	13.1 ^°C	9 ^°C	16.1 ^°C (2010)	5 ^°C (2012)
Humidity	80 ^%	95.2 ^%	58.2 ^%		34 ^% (2012)
Barometer	1016.3 ^hPa	1018.3 ^hPa	1013.9 ^hPa	1024.7 ^hPa (2009)	997 ^hPa (1997)
Wind Speed	9.8 ^km/h	18.5 ^km/h		35.2 ^km/h (1997)
Wind Gust		42.6 ^km/h		55.5 ^km/h (1997)
Precipitation	8.38 ^mm			35.81 ^mm (2010)

Weather Element	Average
Visibility	15.3 ^km
Wind Direction	SSE (162.9 °)

Total Years on Record: 21

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