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Yearly Normals for Mercer Island, WA

Month Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling Jan 34 46 40 4.37 784 0 Feb 35 49 42 3.41 641 0 Mar 37 53 45 3.86 611 0 Apr 41 58 50 2.96 460 0 May 46 64 55 2.57 308 0 Jun 51 68 60 2.26 169 10 Jul 54 73 64 1.32 90 46 Aug 54 74 64 1.35 90 55 Sep 49 69 59 2.09 198 10 Oct 43 60 51 3.25 430 0 Nov 37 51 44 5.11 630 0 Dec 34 45 40 4.99 788 0 Year 43 59 51 37.54 5199 121 Data Controls Monthly | Yearly Related Maps Related Links Normal High Temperatures Normal Low Temperatures Normal Mean Temperatures Normal Precipitation - Forecast - Past Weather