Dukes County Climate
Dukes County, Massachusetts
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
51.3°F
Annual Precip
44.9"
Annual Snowfall
25.3"
Extreme Heat Days
2
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7b
Minimum winter temperature range for plant survival
2,654
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Dukes County
Climate Verdict
Dukes County has a mild, with an average annual temperature of 51.3°F, moderately wet with 44.9 inches of annual precipitation, rare extreme heat with only 2.05 days above 90°F annually, moderate snowfall of 25.3 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 32.1°F. summers are warm — July averages 71.3°F. The 39°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Dukes County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Dukes County closely matches the Massachusetts statewide average temperature of 49.5°F, it is somewhat drier than average for Massachusetts.
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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Track your own weather in Dukes County
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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.