Within the range of swamp white oak, mean annual temperatures vary from 16° C (60° F) in Arkansas to 4° C (40° F) in southern Ontario. Extremes in temperature vary from 41° C (105° F) to -34° C (-30° F). Average annual precipitation is from 640 mm (25 in) in southeast Minnesota to 1270 mm (50 in) in northeast Arkansas. The frost-free period ranges from 210 days in the southern part of the growing area to 120 days in the northern part (4).
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