Authors: Tony K. Wolf and John D. Boyer, Professor of Viticulture and Lecturer, Virginia Tech
Publication Number 463-020, December 2003
Figure 14. Average January minimum of 30°F isotherm based on 30-year (1970-2000) record (purple line) and on a more recent 5-year period (1997-2001, red line). Regions to the north of these lines experience colder average January minimum temperatures, whereas regions to the south experience warmer average January minimum temperatures.
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