Climate and Average Weather Year Round in Portland Maine, United States. In Portland, the summers are comfortable; the winters are freezing, snowy, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 16°F to 78°F and is rarely below 1°F or above 87°F.

According to the State Climate Extremes Committee of NOAA’s National Centers for Environmental Information, Maine hit a record -50 degrees on Jan. 16, 2009.

Portland’s winter weather typically makes a grand entrance around mid-November and lingers until mid-March (sometimes early April). The temperatures tend to range between 40 – 60 degrees, chilly enough for a cozy fall sweater and good insulated jacket.

Also, Maine is located within the primary storm track of the mid-latitudes. Maines climate is characterized by cold, snowy winters and mild summers. Mean annual winter temperatures range from 25°F in the far south to less than 15°F in the northern and interior portions of the state.

Temperatures. Winters are generally cold, but very prolonged cold spells are rare. Average annual snowfall in Maine is 50 to 70 inches along the coast and 60-110 inches inland. January is normally the snowiest month, with an average of about 20 inches.

In Maine, the winner of the coldest town in the state is Allagash. Not the delicious beer but the town named for the river that it was settled on. Allagash comes in with an average annual low temperature of 24.5 degrees.

If you’re looking for the very warmest time to visit Maine, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally mid July where highs are regularly around 76.9°F (24.9°C) with temperatures rarely dropping below 58.7°F (14.8°C) at night.

During spring, Maine is coldest, while in summer it’s Wyoming. Some states are among the ten coldest states year round. Consistently cold throughout the year are Maine, Vermont, Montana and Wyoming….Coldest States in America.

The US average is 205 sunny days. Portland gets some kind of precipitation, on average, 128 days per year….Climate Averages.