Port Jefferson Weather in December

What's the weather like in Port Jefferson (New York) in December 2024?

The climate in Port Jefferson during December can be summarized as cool and damp.

December is in the winter in Port Jefferson and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around a cold 6°C (43°F), whilst at night -2°C (29°F) is normal.

Port Jefferson weather averages (imperial / metric)
Daytime temperature 6°C 42.8°F
Nightly temperature -1.8°C 28.8°F
Average temperature 2.1°C 35.8°F
Daily sunshine 5.1 hrs
Avg rainfall 106 mm 4.2 ins
Rainy days 11 days
Sea temperature 9.6°C 49.2°F
Humidity 69%
Windspeed 19.8kph 12 mph

On average December is the 3rd wettest month of the year in Port Jefferson with around 106mm 4.2 inches of rain making it a 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 5.1 hours of sunshine per day.

December temperatures in Port Jefferson

Port Jefferson average temperature in December

December rainfall

Port Jefferson average rain in December

December hourly sunshine

Port Jefferson 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 Port Jefferson in December 2024.