Penobscot County Climate
Penobscot County, Maine
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
43.3°F
Annual Precip
43.8"
Annual Snowfall
77.4"
Extreme Heat Days
4
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
1,963
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Penobscot County
Climate Verdict
Penobscot County has a cool, averaging 43.3°F annually, moderately wet with 43.8 inches of annual precipitation, rare extreme heat with only 4.475 days above 90°F annually, heavy winter snowfall averaging 77.4 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 16.1°F. summers are pleasantly cool with July averaging 68.3°F. Residents experience a substantial 52°F difference between winter and summer.
Outdoor & Gardening Guidance
Winter sports enthusiasts benefit from reliable snow cover for 3-4 months annually.
Regional Context
Penobscot County closely matches the Maine statewide average temperature of 43.8°F, it is somewhat drier than average for Maine.
Climate Profile
About Penobscot County Weather
Penobscot's brisk northern character
With an annual average of 43.3°F, Penobscot County is over 10 degrees cooler than the median U.S. county. Its climate features the sharp seasonal shifts typical of the humid continental North.
Mirroring the state average
The county's 43.3°F average closely tracks the overall Maine state average of 43.8°F. It serves as a representative middle ground between the state's frigid interior and warmer coast.
Milder than its northern neighbors
Penobscot enjoys a warmer profile than Piscataquis County, which averages only 41.8°F. It also receives about 12 inches less annual snowfall than the 89.9 inches seen in Piscataquis.
Cold winters and short heatwaves
January temperatures average 16.1°F, contributing to a substantial 77.4 inches of annual snowfall. The county typically experiences 4 days of extreme heat above 90°F during the July peak.
Equipping for the Penobscot seasons
Homeowners prioritize winterization and insulation to combat the 19.6°F average winter temperature. Reliable snow tires are essential for navigating the nearly 80 inches of annual accumulation.
Frequently Asked Questions
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Data sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.