Sullivan Weather in December

What's the weather like in Sullivan (Illinois) in December 2024?

The climate in Sullivan during December can be summarized as cold and reasonably dry.

December is in the winter in Sullivan and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around a freezing 4°C (39°F), whilst at night -5°C (23°F) is normal.

Sullivan weather averages (imperial / metric)
Daytime temperature 3.9°C 38.9°F
Nightly temperature -5.1°C 22.9°F
Average temperature -0.6°C 30.9°F
Daily sunshine 4.4 hrs
Avg rainfall 77 mm 3 ins
Rainy days 11 days
Sea temperature 10.1°C 50.2°F
Humidity 77%
Windspeed 18.4kph 11 mph

On average December is the 4th driest month of the year in Sullivan with around 77mm 3 inches of rain making it a reasonably dry 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 4.4 hours of sunshine per day.

December temperatures in Sullivan

Sullivan average temperature in December

December rainfall

Sullivan average rain in December

December hourly sunshine

Sullivan 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 Sullivan in December 2024.

Other monthly averages

Best places to visit in December

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Sullivan weather stats

Sullivan weather statistics
Hottest month: July 30.3°C 86.5°F
Driest month: February 50mm 2ins
Sunniest month: July 10.9hrs
Coldest month: January 0.9°C 33.6°F
Wettest month: July 105mm 4.1ins
Map showing location of Sullivan (39.59948, -88.60784) Sullivan map pin © Google

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