January is normally the snowiest month, with an average of about 20 inches. The Northern Interior may have up to 30 days a year with a minimum of one inch. The Coastal Division rarely has more than 15 to 20 days annually with snowfall of one inch or more, although a "Nor’easter" occasionally drops ten or more inches of snow in a single day. The percentage of possible sunshine varies from 50% in Eastport to about 60% in Portland.Īverage annual snowfall in Maine is 50 to 70 inches in the Coastal Division, 60 to 90 inches in the Southern Interior and 90 to 110 inches in the Northern Interior. The southern portion has 80 to 120 clear days per year free of fog or other precipitation, with northern regions having somewhat less. Heavy ground fogs often appear in low-lying inland areas, but occur most frequently along the coast, for 25 to 60 days annually. Although Maine is rarely subjected to ice storms, hurricanes and tornadoes, 10 to 20 thunderstorms occur annually in the Coastal Division and 15 to 30 elsewhere. Annual precipitation in Maine averages 40 inches in the Northern Division, about 42 inches in the South and 46 inches in the Coastal Division.
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