Aroostook County Climate
Aroostook County, Maine
Avg Annual Temp
39.6°F
Annual Precip
40.3"
Annual Snowfall
100.2"
Extreme Heat Days
1.8545454545454547
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Aroostook County Weather
A truly northern, subarctic-leaning chill
With an average annual temperature of just 39.6°F, this county is significantly colder than the national median. It experiences one of the most rigorous northern climates in the contiguous United States.
Maine's coldest county by far
Aroostook’s 39.6°F annual average is the lowest in the state, falling well below the 43.8°F state average. Winter temperatures here average a biting 13.9°F from December through February.
Colder than all southern neighbors
It averages nearly 5 degrees cooler than Franklin County and over 7 degrees colder than the Maine coast. The distance from the ocean allows for more extreme and prolonged winter temperatures.
Extreme snowfall and rare summer heat
The county receives a staggering 100.2 inches of snow annually while only seeing 2 days of extreme heat. July averages remain a comfortable 65.7°F, offering a reprieve from national heatwaves.
Prioritize insulation and heavy-duty gear
Robust home insulation is a necessity to survive winters that average 13.9°F. Residents should invest in professional-grade snow blowers to manage the hundred-inch annual snowfall.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.