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Yearly Normals for Island Lake, IL

Month Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling Jan 12 28 20 2.04 1393 0 Feb 17 34 25 1.64 1114 0 Mar 26 45 36 2.67 917 0 Apr 37 59 48 3.83 524 2 May 48 72 60 3.53 220 56 Jun 57 82 70 4.04 30 165 Jul 63 86 74 3.85 4 295 Aug 62 83 72 4.07 15 244 Sep 54 75 65 3.51 88 73 Oct 43 63 53 2.69 393 7 Nov 31 46 39 2.81 796 0 Dec 19 33 26 2.37 1215 0 Year 39 59 49 37.05 6709 842 Data Controls Monthly | Yearly Related Maps Related Links Normal High Temperatures Normal Low Temperatures Normal Mean Temperatures Normal Precipitation - Forecast - Past Weather