Weather in Groton: January
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Average day temperature: | 36.7°F |
| Average night temperature: | 30.8°F | |
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Sea water temperature: | 42.8°F |
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Number of sunny days: | 10 days |
| Day length: | 9.2 - 10.0 hours | |
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Number of rainy days: | 3 days |
| Precipitation totals: | 1.2 in. | |
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| Groton |
temperature
| Groton |
Air temperature in January, °F
| Day temperature | Night temperature |
The highest day temperature during January of 2025 was 46°F. At the same time the lowest night temperature was 15°F. Daily and nightly averages during January were 33.9°F and 27.9°F.
Sea water temperature in Groton in January, °F
The average sea water temperature in January of 2025 was 41.1°F. The highest and lowest sea temperatures during the month were 44.6°F and 38.3°F.
| Sunny days | |
| Partly cloudy days | |
| Cloudy days |
Number of sunny, partly cloudy and cloudy days in January is almost equal.
Precipitation total in January, in.
Precipitation total value in Groton in January is 1.2 in. Other months of the year show relatively similar values.
The average wind speed value in January is 10.1 mph It makes January 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 January is: 5.0.
Best time for vacation in Groton
Groton on a weather map
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