Maine Annual Temperatures and Records


Avg High Temp

Avg Low Temp 

Avg Annual Temp

Avg # days > 90F Avg # days < 32F  Record High Temp Record Low Temp
Augusta 54.4 36.4 45.4 4 148 100/ 1955 -33 / 1975
Caribou 48.6 29.5 39.1 2 186 96 / 1944 -41 / 1955
Portland 55.0 36.4 45.7 6 128 103 / 1975 -26 / 1971
  • Maine annual average temperature - 40.97 degrees, 48th warmest state in the U.S.
  • Record Hottest year in Maine - 1913 / Avg temperature 45.65 degrees
  • Record Coldest year in Maine - 1904 / Avg temperature 38.44 degrees
  • Maine average Summer temperature (June, July, August) 63.7 F degrees,  46th warmest U.S. summer state
  • Maine average Winter temperature (December, January, February) 16.8 F degrees, 4th coldest U.S. winter state

Maine's Temperature Records

  • Hottest temperature ever recorded: 105 F, N. Bridgton, southern Maine, 7/10/1911
  • Coldest temperature ever recorded: -48 F, Van Buren, northern Maine, 1/19/1925
  • Hottest location ranked by highest average annual temperature: Lewiston, southern Maine, 45.9 F
  • Coldest location ranked by lowest average annual temperature: Clayton Lake, northern Maine, 37.5 F


The range in average summertime temperatures in Maine is only about five degrees from north to south. This difference increases to seven or eight degrees during the transition seasons of spring and fall and to over 10 degrees during the winter. Daily average temperatures during the summer are usually cool relative to most of the rest of the nation. Highest daily averages barely exceed 70 F, as is found in the central parts of Maine around Augusta and Lewiston. Average summer temperature statewide is 64 F. Average winter temperature is 17. Spring and fall average temperatures are 39 and 45 F, respectively.

In the Northern Division, temperatures greater than 90 F rarely occur in any one year. During the wintertime, however, minimum temperatures drop subzero around the State almost every winter at one time or another. As expected, the greatest number of days with a minimum temperature of 0 F or less occurs in the Northern Division with around 40 to 50 days. The Southern Interior averages about 20 days a year below 0 F, whereas the moderating effect of the ocean only allows about 10 such days along the coast. Furthermore, temperatures can drop below freezing almost anytime from late August or September to June in the Northern Division, and from mid-September to mid-May in the Southern Interior. Consequently, frost can occur eight to 10 months per year in most of Maine. The number of days between the first and last frost results in a growing season of 90 to 120 days in the Northern Division and 120 to 180 in both the Southern Interior and Coastal Divisions. The higher parts of that range are found closer to the coast.



Maine precipitation averages and extremes, precipitation and temperature data for all U.S. states and Top 10 U.S. climate extremes
Data source: National Climatic Data Center