The highest day temperature in December 2025 was 52°F. The lowest night temperature was -6°F. The average values for day and night temperatures during December were 23.3°F и 15.7°F respectivly.

The average sea surface temperature in December 2025 for Moncton was 32.6°F. The maximum and minimum values were 29.4°F and 37.4°F respectively.

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

Precipitation total in December for Moncton is 1.1 in. This value is relatively stable throughout the year.

The average wind speed in December is 12.9 mph. It makes December one of the most windy months of the year for Moncton.

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 Moncton in December is 3.3 hours.