MERCER ISLAND, WASHINGTON

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Elevation: 69 meters Latitude: 47 32N Longitude: 122 18W

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DAILY WEATHER AVERAGE - 30 SEPTEMBER

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	14.3 ^°C	17.9 ^°C	11.3 ^°C	23 ^°C (1998)	6.1 ^°C (2009)
Dewpoint	10.1 ^°C	11.8 ^°C	8.3 ^°C	16.7 ^°C (2000)	3.3 ^°C (2012)
Humidity	77.4 ^%	91.2 ^%	59.5 ^%		37 ^% (2012)
Barometer	1015.6 ^hPa	1017.9 ^hPa	1012.5 ^hPa	1029.8 ^hPa (2012)	999 ^hPa (2013)
Wind Speed	8.2 ^km/h	17.7 ^km/h		29.6 ^km/h (2000)
Wind Gust		37 ^km/h		46.3 ^km/h (1997)
Precipitation	12.45 ^mm			26.16 ^mm (2007)

Weather Element	Average
Visibility	17.1 ^km
Wind Direction	ESE (122.1 °)

Weather Element	Total
Heating Degree Days	3.7 (Base 18.3)
Growing Degree Days	4.7 (Base 10)

Total Years on Record: 21

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