The highest day temperature in December 2023 was 57°F. The lowest night temperature was 26°F. The average values for day and night temperatures during December were 44.4°F и 41.9°F respectivly.

The average sea surface temperature in December 2023 for Charlestown was 48.9°F. The maximum and minimum values were 45.8°F and 51.4°F respectively.

Most of the days in December are gloomy but you can also expect sunny days.

Precipitation total in December for Charlestown is 1.7 in. It makes december one of the most rainy months of the year.

The average wind speed in December is 12.1 mph. It makes December one of the most windy months of the year for Charlestown.

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 Charlestown in December is 4.8 hours.