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Yearly Normals for Winnetka, IL

Month Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling Jan 12 29 20 1.6 1387 0 Feb 17 33 25 1.4 1126 0 Mar 26 43 35 2.15 945 0 Apr 36 55 45 3.73 598 0 May 46 67 56 3.44 301 30 Jun 55 77 66 3.62 79 114 Jul 61 82 72 3.49 11 213 Aug 61 80 70 4.22 37 201 Sep 52 73 63 3.4 118 50 Oct 41 62 51 2.42 430 5 Nov 30 47 39 2.57 793 0 Dec 18 34 26 2.05 1206 0 Year 38 57 47 34.09 7031 613 Data Controls Monthly | Yearly Related Maps Related Links Normal High Temperatures Normal Low Temperatures Normal Mean Temperatures Normal Precipitation - Forecast - Past Weather