Nantucket County Climate
Nantucket County, Massachusetts
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
50.7°F
Annual Precip
40.9"
Annual Snowfall
—
Extreme Heat Days
0
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7b
Minimum winter temperature range for plant survival
2,344
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Nantucket County
Climate Verdict
Nantucket County has a mild, with an average annual temperature of 50.7°F, moderately wet with 40.9 inches of annual precipitation, rare extreme heat with only 0.2 days above 90°F annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 33.1°F. summers are pleasantly cool with July averaging 69.0°F. The 36°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Nantucket County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Nantucket County closely matches the Massachusetts statewide average temperature of 49.5°F, it is also noticeably drier, receiving 6.5 inches less precipitation than the state average.
Climate Profile
About Nantucket County Weather
Nantucket's Unique Maritime Environment
Nantucket averages 50.7°F annually, benefiting from a maritime climate that is significantly moderated by the Atlantic Ocean. This keeps the island warmer than many mainland peers during the winter months.
A Warmer Massachusetts Outlier
At 50.7°F, Nantucket is warmer than the 49.5°F state average and ranks as one of the state's mildest counties. Its 40.9 inches of annual precipitation is noticeably lower than the state average of 47.4 inches.
Cooler Summers Than the Mainland
While neighboring coastal counties like Plymouth hit 72.6°F in July, Nantucket peaks at a much cooler 69.0°F. The island is the only county in this set to record zero days of extreme heat over 90°F.
Mild Winters and Gentle Summers
Winter temperatures average 35.1°F, which is much warmer than the 26.3°F found in Worcester. Summer remains comfortable with a 66.7°F average, though specific annual snowfall data for the island is currently unavailable.
Focus on Wind and Moisture
While residents don't need to worry about 90-degree heat, they must prepare for high humidity and salt air. Salt-resistant building materials and wind-rated windows are more critical here than inland snow gear.
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.