Maine : Climatic Conditions

There are three climatic zones in Maine - the northern interior zone, including the northern half of the state, between Quebec and New Brunswick; the southern interior zone; and the coastal zone. Coastal zone has a moderate climate while the northern zone is drier and cooler in four seasons when compared to any other zone.
The annual mean temperature in the northern zone is about 40°F (5°C); in the southern interior zone, 44°F (7°C); and in the coastal zone, 46°F (8°C). The mean annual precipitation increases from 40.2 in (102 cm) in the north to 41.5 in (105 cm) in the southern interior and 45.7 in (116 cm) on the coast. Average annual precipitation at Portland (1971–2000) was 45.8 in (116 cm). Average annual snowfall is 78 in (198 cm).