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Yearly Normals for Duwamish, WA

Month Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling Jan 36 47 42 5.24 729 0 Feb 37 51 44 4.09 593 0 Mar 39 55 47 3.92 564 0 Apr 43 59 51 2.75 423 0 May 48 65 57 2.03 266 4 Jun 53 70 61 1.55 131 15 Jul 56 75 66 0.93 52 67 Aug 57 75 66 1.16 50 79 Sep 53 70 61 1.61 139 27 Oct 46 60 53 3.24 362 0 Nov 40 52 46 5.67 571 0 Dec 36 47 41 6.06 735 0 Year 45 60 53 38.25 4615 192 Data Controls Monthly | Yearly Related Maps Related Links Normal High Temperatures Normal Low Temperatures Normal Mean Temperatures Normal Precipitation - Forecast - Past Weather