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Yearly Normals for East Alton, IL

Month Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling Jan 17 35 26 1.92 1200 0 Feb 22 41 32 2.01 932 0 Mar 32 53 42 3.51 702 0 Apr 42 64 53 4.14 364 8 May 52 74 63 3.95 150 93 Jun 61 83 72 3.68 12 228 Jul 66 88 77 3.51 0 360 Aug 63 86 75 2.91 9 302 Sep 55 79 67 3.23 71 121 Oct 43 68 56 2.86 310 13 Nov 34 53 43 3.77 658 0 Dec 23 40 31 2.82 1041 0 Year 43 64 53 38.31 5449 1125 Data Controls Monthly | Yearly Related Maps Related Links Normal High Temperatures Normal Low Temperatures Normal Mean Temperatures Normal Precipitation - Forecast - Past Weather