Weather in Martha's Vineyard: December
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Average day temperature: | 42.4°F |
| Average night temperature: | 39.2°F | |
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Sea water temperature: | 46.6°F |
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Number of sunny days: | 12 days |
| Day length: | 9.2 - 9.4 hours | |
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Number of rainy days: | 2 days |
| Precipitation totals: | 1.2 in. | |
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forecast
| Martha's Vineyard |
temperature
| Martha's Vineyard |
Air temperature in December, °F
The highest day temperature during December of 2025 was 55°F. At the same time the lowest night temperature was 16°F. Daily and nightly averages during December were 38.3°F and 31.4°F.
Sea water temperature in Martha's Vineyard in December, °F
The average sea water temperature in December of 2025 was 45.6°F. The highest and lowest sea temperatures during the month were 50.4°F and 41.9°F.
Number of sunny, partly cloudy and cloudy days in December is almost equal.
Precipitation total in December, in.
Precipitation total value in Martha's Vineyard in December is 1.2 in. Other months of the year show relatively similar values.
The average wind speed value in December is 14.5 mph It makes December most windy month of the year.
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in December is: 5.1.
Best time for vacation in Martha's Vineyard
Martha's Vineyard on a weather map
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