Below are average first measurable snowfall dates for locations in northeast and north-central Wisconsin. The average dates were compiled from 30 years of data (1981-2010). 

                       Avg Date      Avg Date      Avg Date
Location               0.1 Inch      1.0 Inch      3.0 Inches
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Antigo                 Nov  9        Nov 13        Nov 28
Appleton               Nov 15        Nov 27        Dec 20
Chilton                Nov 17        Nov 22        Dec 16
Clintonville           Nov 16        Nov 25        Dec 15
Green Bay              Nov 13        Nov 23        Dec 16

Kewaunee               Nov 27        Nov 29        Dec 14
Lac Vieux Desert       Oct 20        Oct 25        Nov  9
Laona                  Oct 21        Nov  4        Nov 17
Manitowoc              Not avbl      Not avbl      Not avbl
Marinette              Nov 20        Nov 28        Dec 22

Marshfield             Nov  9        Nov 12        Dec  2
Merrill                Nov  7        Nov 15        Nov 29
Oconto                 Nov 18        Nov 22        Dec 17
Oshkosh                Nov 27        Dec  2        Dec 22
Rhinelander            Nov  5        Nov  9        Nov 27
St Germain             Oct 31        Nov  2        Nov 20

Shawano                Nov 18        Nov 21        Dec  6
Stevens Point          Nov 17        Nov 25        Dec 14
Sturgeon Bay           Nov 20        Nov 25        Dec 16
Two Rivers             Nov 27        Dec  1        Dec 16
Washington Island      Nov 26        Dec  1        Dec 16
Wausau                 Nov  3        Nov 12        Nov 29
Wisc. Rapids           Nov 17        Nov 21        Dec  2

 

There are many factors that can influence the average date at a particular location. During the fall and early winter, storm tracks can play a significant role between snow and rain. Along Lake Michigan and the waters of Green Bay, the warmer waters tend to keep the region several degrees above freezing resulting in a slower changeover to all snow during the fall and early winter.

Other factors than can influence the average dates include the location of the observing location that may be enclosed by trees or are in a wide open area. In addition, during the fall and early winter, volunteer observers may not measure the snowfall for several hours after the event which may allow for the snow to melt. This is especially true during the overnight hours early in the season where snow occurs and then melts before the observer makes a measurement.


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