Mercer Island December Weather Averages Washington, United States of America

December Weather Averages for Mercer Island

High Temp	7°C	44°F
Low Temp	1°C	35°F
Avg Temp	4°C	39°F
Sunshine Hours	109 hours
Rainfall	178.73 mm	7.04 In
Rain days	13 days
Pressure	1018 mb	31 In

Mercer Island December Averages Year by Year

Year	High Temp	Low Temp	Avg Temp	Sunshine Hours	Rainfall	Rain days	Pressure
2009	6°C / 42°F	-1°C / 31°F	2°C / 35°F	212 hours	80.60 mm / 3.17 In	8 days	1020 mb / 31 In
2010	7°C / 45°F	2°C / 35°F	4°C / 39°F	115 hours	222.80 mm / 8.77 In	18 days	1013 mb / 30 In
2011	7°C / 44°F	1°C / 33°F	3°C / 38°F	214 hours	75.00 mm / 2.95 In	6 days	1025 mb / 31 In
2012	6°C / 42°F	2°C / 35°F	3°C / 38°F	62 hours	230.97 mm / 9.09 In	20 days	1012 mb / 30 In
2013	5°C / 41°F	0°C / 32°F	2°C / 36°F	153 hours	80.17 mm / 3.16 In	9 days	1025 mb / 31 In
2014	8°C / 46°F	3°C / 37°F	5°C / 41°F	137 hours	179.70 mm / 7.07 In	15 days	1017 mb / 31 In
2015	7°C / 44°F	3°C / 37°F	4°C / 40°F	60 hours	293.64 mm / 11.56 In	14 days	1013 mb / 30 In
2016	4°C / 39°F	0°C / 32°F	2°C / 35°F	99 hours	140.24 mm / 5.52 In	13 days	1021 mb / 31 In
2017	7°C / 45°F	1°C / 35°F	4°C / 39°F	150 hours	174.91 mm / 6.89 In	12 days	1026 mb / 31 In
2018	8°C / 47°F	3°C / 37°F	5°C / 41°F	113 hours	189.13 mm / 7.45 In	13 days	1019 mb / 31 In
2019	8°C / 47°F	4°C / 39°F	6°C / 42°F	36 hours	213.00 mm / 8.39 In	9 days	1016 mb / 30 In
2020	8°C / 46°F	3°C / 37°F	5°C / 42°F	113 hours	193.34 mm / 7.61 In	14 days	1020 mb / 31 In
2021	4°C / 40°F	0°C / 33°F	2°C / 36°F	41 hours	182.50 mm / 7.19 In	18 days	1012 mb / 30 In
2022	4°C / 40°F	-1°C / 31°F	2°C / 35°F	50 hours	187.80 mm / 7.39 In	17 days	1015 mb / 30 In
2023	9°C / 48°F	4°C / 39°F	6°C / 43°F	79 hours	237.07 mm / 9.33 In	13 days	1016 mb / 30 In

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