Weather in New Haven: December
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Average day temperature: | 40.5°F |
| Average night temperature: | 35.0°F | |
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Sea water temperature: | 45.8°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: | 3 days |
| Precipitation totals: | 1.6 in. | |
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forecast
| New Haven |
temperature
| New Haven |
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 13°F. Daily and nightly averages during December were 36.4°F and 28.4°F.
Sea water temperature in New Haven in December, °F
The average sea water temperature in December of 2025 was 43.5°F. The highest and lowest sea temperatures during the month were 48.9°F and 39.0°F.
Mostly all days in December are sunny but cloudy days are also possible.
Precipitation total in December, in.
Precipitation total value in New Haven in December is 1.6 in. Other months of the year show relatively similar values.
The average wind speed value in December is 10.2 mph It makes December one of the most windy months 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 New Haven
New Haven on a weather map
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