MERCER ISLAND, WASHINGTON

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

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DAILY WEATHER AVERAGE - 8 DECEMBER

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	5.4 ^°C	8.2 ^°C	2.8 ^°C	17.2 ^°C (2015)	-7.8 ^°C (2013)
Dewpoint	1.4 ^°C	3.1 ^°C	-0.4 ^°C	13.9 ^°C (2015)	-18.9 ^°C (2009)
Humidity	77.9 ^%	89.7 ^%	63 ^%		22 ^% (2009)
Barometer	1019 ^hPa	1023.4 ^hPa	1013.9 ^hPa	1036.6 ^hPa (1998)	983.1 ^hPa (2004)
Wind Speed	9 ^km/h	18 ^km/h		31.5 ^km/h (2004)
Wind Gust		48.1 ^km/h		51.8 ^km/h (2001)
Precipitation	13.97 ^mm			54.86 ^mm (2015)

Weather Element	Average
Visibility	16.1 ^km
Wind Direction	ESE (111.2 °)

Weather Element	Total
Heating Degree Days	12.9 (Base 18.3)
Growing Degree Days	2.6 (Base 10)

Total Years on Record: 21

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