New Brunswick Weather in December

What's the weather like in New Brunswick (New Jersey) in December 2025?

The climate in New Brunswick during December can be summarized as cool and a little damp.

December is in the winter in New Brunswick and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around a cold 6°C (42°F), whilst at night -3°C (27°F) is normal.

New Brunswick weather averages (imperial / metric)
Daytime temperature 5.8°C 42.4°F
Nightly temperature -3°C 26.7°F
Average temperature 1.4°C 34.5°F
Daily sunshine 5 hrs
Avg rainfall 97 mm 3.8 ins
Rainy days 11 days
Sea temperature 8.6°C 47.5°F
Humidity 68%
Windspeed 18.7kph 12 mph

On average December is the 5th driest month of the year in New Brunswick with around 97mm 3.8 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 11 days, although this may vary considerably.

On the flip side this corresponds to an average of 5 hours of sunshine per day.

December temperatures in New Brunswick

New Brunswick average temperature in December

December rainfall

New Brunswick average rain in December

December hourly sunshine

New Brunswick average rain in December

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in New Brunswick in December 2025.

Other monthly averages

Best places to visit in December

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

New Brunswick weather stats

New Brunswick weather statistics
Hottest month: July 29.2°C 84.6°F
Driest month: February 76mm 3ins
Sunniest month: August 9hrs
Coldest month: January 2.7°C 36.9°F
Wettest month: July 123mm 4.8ins
Map showing location of New Brunswick (40.48622, -74.45182) New Brunswick map pin © Google

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