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Yearly Normals for Diamond, IL

Month Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling Jan 13 30 21 1.75 1361 0 Feb 18 35 27 1.59 1078 0 Mar 29 47 38 2.74 833 0 Apr 39 61 50 3.54 459 5 May 50 73 61 3.95 194 79 Jun 59 83 71 4.16 21 190 Jul 63 85 74 3.72 4 292 Aug 61 83 72 3.4 24 235 Sep 53 76 65 2.95 96 79 Oct 41 64 52 2.54 402 9 Nov 31 48 40 3.09 762 0 Dec 19 35 27 2.36 1174 0 Year 39 60 50 35.79 6408 889 Data Controls Monthly | Yearly Related Maps Related Links Normal High Temperatures Normal Low Temperatures Normal Mean Temperatures Normal Precipitation - Forecast - Past Weather