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Yearly Normals for Watertown, SD

Month Temperatures (°F) Precipitation (in) Degree Days Min Max Avg Heating Cooling Jan -1 20 9 0.59 1733 0 Feb 6 26 16 0.52 1368 0 Mar 18 38 28 1.44 1151 0 Apr 30 56 43 2.03 669 4 May 43 69 56 2.83 311 22 Jun 52 77 64 3.65 101 78 Jul 56 82 69 3.64 50 175 Aug 55 80 68 3.23 63 143 Sep 45 71 58 2.06 229 26 Oct 33 58 46 1.86 600 0 Nov 18 37 28 0.93 1126 0 Dec 4 24 14 0.35 1581 0 Year 30 53 42 23.13 8982 448 Data Controls Monthly | Yearly Related Maps Related Links Normal High Temperatures Normal Low Temperatures Normal Mean Temperatures Normal Precipitation - Forecast - Past Weather