The highest day temperature in December 2023 was 57°F. The lowest night temperature was 33°F. The average values for day and night temperatures during December were 42.9°F и 43.2°F respectivly.

The average sea surface temperature in December 2023 for Siasconset was 45.0°F. The maximum and minimum values were 42.6°F and 47.0°F respectively.

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

Precipitation total in December for Siasconset is 1.6 in.

The average wind speed in December is 18.7 mph. It makes December one of the most windy months of the year for Siasconset.

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 Siasconset in December is 4.0 hours.