Maine experiences a humid continental climate (Köppen climate classification Dfb), with warm (although generally not hot), humid summers. Winters are cold and snowy throughout the state, and are especially severe in the northern parts of Maine. Coastal areas are moderated somewhat by the Atlantic Ocean. Daytime highs are generally in the 75–80 °F (24–27 °C) range throughout the state in July, with overnight lows in the high 50s°F (around 15 °C). January temperatures range from highs near 32 °F (0 °C) on the southern coast to overnight lows below 0 °F (-18 °C) in the far north.

Maine is generally safe from hurricanes and tropical storms. By the time they reach the state, many have become extratropical and few hurricanes have made landfall in Maine. Maine has fewer days of thunderstorms than any other state east of the Rockies, with most of the state averaging less than 20 days of thunderstorms a year. Tornadoes are rare in Maine with the state averaging fewer than two per year, mostly occurring in the southern part of the state.

In January 2009, a new record low temperature for the state was set at -50 °F, tying the New England record. The state's record high temperature is 105 °F, set in July 1911.

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