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Yearly Normals for Grinnell, IA

Month Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling Jan 7 27 17 0.95 1495 0 Feb 13 33 23 1.05 1185 0 Mar 25 45 35 2.39 928 0 Apr 37 59 48 3.31 516 2 May 49 71 60 4.25 209 57 Jun 59 81 70 5.57 26 174 Jul 63 84 74 4.58 6 281 Aug 60 82 71 4.74 27 217 Sep 50 75 63 3.53 129 53 Oct 38 62 50 2.63 458 3 Nov 26 45 36 2.16 886 0 Dec 14 31 22 1.24 1326 0 Year 37 58 47 36.4 7191 787 Data Controls Monthly | Yearly Related Maps Related Links Normal High Temperatures Normal Low Temperatures Normal Mean Temperatures Normal Precipitation - Forecast - Past Weather