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Zip code 54646, Necedah WI is in USDA Hardiness Zone 4b: -25F to -20F. Using updated climate data through 2010, 54646 is in the Plantmaps Hardiness Zone 3b: -35F to -30F. The average first frost in 54646 is between September 11 - 20, while the average last frost occurs between May 11 - 20. 54646 is part of Ecoregion 51c - Glacial Lake Wisconsin Sand Plain. 54646 rarely has days where the temperatue exceeds 86°F. The average annual high temperature in 54646 is 57°F and the average annual low temperature is 34°F. The average high temperature in July (Summer) is 81°F, while the average high temperature in January (Winter) is 25°F. Local Climate Data Mon Min F Max F Precip In. Jan 5 25 .98 Feb 10 32 .92 Mar 21 44 1.94 Apr 33 59 3.02 May 45 72 3.49 Jun 54 80 3.8 Jul 59 84 4.28 Aug 57 81 4.6 Sep 48 72 3.81 Oct 37 60 2.27 Nov 25 43 2.16 Dec 12 29 1.19 Ann 34 57 32.46