Weather in Old Saybrook: December
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Average day temperature: | 41.1°F |
| Average night temperature: | 35.0°F | |
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Sea water temperature: | 47.8°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: | 2 days |
| Precipitation totals: | 1.6 in. | |
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forecast
| Old Saybrook |
temperature
| Old Saybrook |
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 37.2°F and 28.2°F.
Sea water temperature in Old Saybrook in December, °F
The average sea water temperature in December of 2025 was 45.5°F. The highest and lowest sea temperatures during the month were 50.2°F and 41.5°F.
Mostly all days in December are sunny but cloudy days are also possible.
Precipitation total in December, in.
Precipitation total value in Old Saybrook in December is 1.6 in. Other months of the year show relatively similar values.
The average wind speed value in December is 10.5 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: 5.3.
Best time for vacation in Old Saybrook
Old Saybrook on a weather map
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