Nantucket County Climate
Nantucket County, Massachusetts
Avg Annual Temp
50.7°F
Annual Precip
40.9"
Annual Snowfall
—
Extreme Heat Days
0.2
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.