Barnstable County Climate
Barnstable County, Massachusetts
Avg Annual Temp
50.8°F
Annual Precip
45.4"
Annual Snowfall
23.0"
Extreme Heat Days
1.35
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Barnstable County Weather
Barnstable’s Coastal Maritime Climate
Barnstable’s 50.8°F average annual temperature is cooler than the national median but warmer than the state average. This coastal region enjoys a humid continental climate moderated by the Atlantic Ocean.
Warmest in the Commonwealth
Barnstable ranks among the warmest counties in Massachusetts, exceeding the state average of 49.5°F. Its coastal location keeps it significantly milder than inland peers during the winter months.
A Milder Coastal Neighbor
Barnstable shares a similar maritime profile with Dukes County, which is slightly warmer at 51.3°F. It remains notably warmer than Bristol County’s inland sections during the peak of winter.
Mild Summers and Snowy Winters
The county experiences only one extreme heat day per year, with July averages staying a comfortable 71.2°F. Residents see about 23.0 inches of annual snowfall, which is lower than many of its mainland neighbors.
Planning for Island Life
Because the ocean regulates temperatures, residents can focus less on extreme heat cooling and more on moisture control from the 45.4 inches of annual rain. Winter gear is essential, but the 31.6°F January average is gentler than the state's interior.
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.