MERCER ISLAND, WASHINGTON

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

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DAILY WEATHER AVERAGE - 13 DECEMBER

[ °F ] °C

Weather Element	Avg	Avg High	Avg Low	Record High	Record Low
Temperature	6.5 ^°C	8.9 ^°C	4.2 ^°C	13.3 ^°C (2010)	-1.1 ^°C (2011)
Dewpoint	3.4 ^°C	5.6 ^°C	0.7 ^°C	11.7 ^°C (1998)	-6.1 ^°C (2004)
Humidity	81.9 ^%	93.5 ^%	65.8 ^%		29 ^% (2004)
Barometer	1013.2 ^hPa	1019 ^hPa	1006.8 ^hPa	1036.2 ^hPa (1996)	983.4 ^hPa (2001)
Wind Speed	11.7 ^km/h	23.8 ^km/h		48.1 ^km/h (2015)
Wind Gust		46.7 ^km/h		77.7 ^km/h (2006)
Precipitation	10.67 ^mm			48.77 ^mm (2001)

Weather Element	Average
Visibility	15.1 ^km
Wind Direction	ESE (128.2 °)

Weather Element	Total
Heating Degree Days	11.8 (Base 18.3)
Growing Degree Days	1.7 (Base 10)

Total Years on Record: 21

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