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Winter daily maximum temperatures were examined for 56 sites in northern portions of Ontario, Michigan, Wisconsin, and Minnesota over the period 1960-88. The longest sub-freezing period of winter averaged 20-30 days in the southern portion of the region, 30-40 days around Lake Superior, and 90-100 days in extreme northwestern Ontario. These are twice as long as sub-freezing periods at similar latitudes in eastern Canada. The sub-freezing period is shortened by about one week along the shores of the Great Lakes. There is annual spatial correlation of the longest sub-freezing period, indicating regional synoptic-scale control. The late 1970s had the longest sub-freezing periods but no significant linear trend was found in lengths of sub-freezing periods. The average date of the first significant thaw (> 10°C) ranged from early March in the south to late April in the north and is delayed 1-2 weeks along the shores of the Great Lakes.

Winter Sub-Freezing Periods and Significant Thaws in the Boreal Forest Region of Central North America