The highest day temperature in December 2025 was 56°F. The lowest night temperature was -2°F. The average values for day and night temperatures during December were 28.9°F и 18.8°F respectivly.

The average sea surface temperature in December 2025 for Brunswick was 41.2°F. The maximum and minimum values were 37.4°F and 44.0°F respectively.

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

Precipitation total in December for Brunswick is 1.3 in. It makes december one of the most rainy months of the year.

The average wind speed in December is 9.0 mph. It makes December the most windy month of the year for Brunswick.

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 Brunswick in December is 4.8 hours.