Weather in Block Island: December
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Average day temperature: | 42.6°F |
| Average night temperature: | 39.8°F | |
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Sea water temperature: | 49.9°F |
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Number of sunny days: | 13 days |
| Day length: | 9.2 - 9.4 hours | |
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Number of rainy days: | 2 days |
| Precipitation totals: | 1.4 in. | |
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forecast
| Block Island |
temperature
| Block Island |
Air temperature in December, °F
The highest day temperature during December of 2025 was 53°F. At the same time the lowest night temperature was 19°F. Daily and nightly averages during December were 38.6°F and 34.1°F.
Sea water temperature in Block Island in December, °F
The average sea water temperature in December of 2025 was 47.4°F. The highest and lowest sea temperatures during the month were 51.6°F and 43.5°F.
Mostly all days in December are sunny but cloudy days are also possible.
Precipitation total in December, in.
Precipitation total value in Block Island in December is 1.4 in. Other months of the year show relatively similar values.
The average wind speed value in December is 16.1 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: 5.2.
Best time for vacation in Block Island
Block Island on a weather map
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