The highest day temperature in December 2023 was 57°F. The lowest night temperature was 24°F. The average values for day and night temperatures during December were 43.7°F и 39.0°F respectivly.

The average sea surface temperature in December 2023 for Groton was 48.3°F. The maximum and minimum values were 45.0°F and 51.8°F respectively.

You can expect various weather conditions during December. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in December for Groton is 1.8 in. It makes december the most rainy month of the year.

The average wind speed in December is 9.2 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Groton in December is 4.8 hours.