Dukes County Climate
Dukes County, Massachusetts
Avg Annual Temp
51.3°F
Annual Precip
44.9"
Annual Snowfall
25.3"
Extreme Heat Days
2.05
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Dukes County Weather
Martha’s Vineyard Maritime Trends
Dukes County features a 51.3°F average annual temperature, which is the warmest in the state but still below the national median. The island climate provides a buffered environment compared to the Massachusetts mainland.
Leading the State in Warmth
At 51.3°F, Dukes County sits 1.8 degrees above the state average of 49.5°F. This makes it the warmest county in Massachusetts, largely due to the insulating effect of the surrounding ocean.
Island vs. Mainland Comparison
Dukes County is slightly warmer than its neighbor Barnstable and much milder in winter than Bristol County. It enjoys a January average of 32.1°F, the highest among these eight counties.
Temperate Island Seasons
The island sees only 2 days of extreme heat annually, with summers averaging a cool 68.8°F. Residents experience a manageable 25.3 inches of snow per year, less than half of what falls in Essex County.
Maritime Home Planning
HVAC systems should be optimized for humidity control rather than extreme heat, as temperatures rarely hit 90°F. The 44.9 inches of annual rain require durable roofing and coastal-grade building materials.
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.