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Yearly Normals for Janesville, WI

Month Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling Jan 9 27 18 1.35 1469 0 Feb 14 32 23 1.09 1181 0 Mar 25 45 35 1.89 933 0 Apr 35 58 47 3.47 554 1 May 47 71 59 3.44 242 48 Jun 56 81 68 4.08 39 131 Jul 60 84 72 3.18 8 228 Aug 58 81 70 4.34 35 181 Sep 49 74 62 3.56 144 37 Oct 38 61 50 2.25 482 3 Nov 28 45 36 2.31 859 0 Dec 15 31 23 1.82 1292 0 Year 36 57 47 32.78 7238 629 Data Controls Monthly | Yearly Related Maps Related Links Normal High Temperatures Normal Low Temperatures Normal Mean Temperatures Normal Precipitation - Forecast - Past Weather