Maine weather in December

The state broadly agrees with itself in December: afternoons run 38° in Portland, Maine and 38° in Bar Harbor, with everywhere else in between.

Based on 2 weather stations. Two stations, both on the coast — the North Woods interior gets a longer, colder winter than either of these.

Southern Coast

Highs near 38°, nights around 22°, and 14.6 in of snow in a typical December.

Place	Highs / lows	Wet days	Snow	The short version
Portland, Maine	38° / 22°	6	14.6 in	Snow returns in force; the dark arrives absurdly early.

Highs near 38°, nights around 22°, and 5.7 in of rain in a typical December.

Place	Highs / lows	Wet days	The short version
Bar Harbor	38° / 22°	14	More days with weather than without, and an early dark.

Each place above has its own page for the full story — what the month feels like, what to pack, and whether the timing is right.