Illinois weather in December 2020

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Below are average maximum temperatures at popular destinations in Illinois in December. Select a destination to see more weather parameters.

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The December weather guide for Illinois shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

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How cold is it in Illinois in December?

Daytime temperatures usually reach 2°C in Chicago, Illinois in December, falling to -7°C at night.

How sunny is it in Illinois in December?

There are normally 3 hours of bright sunshine each day in Chicago, Illinois in December - that's 37% of daylight hours.

Is the sea cold around Illinois in December?

The average sea temperature around Chicago, Illinois in December is 5°C.

Does it rain in Illinois in December?

There are usually 12 days with some rain in Chicago, Illinois in December and the average monthly rainfall is 62mm. Rain may fall as snow in this month.

Illinois sunrise & sunset times for December 2020

Browse the sunrise & sunset times for Illinois in December 2020. Select a month to view Illinois sunrise & sunset times for the next twelve months. The Illinois sunrise & sunset times shown below are for Chicago.


Date Sunrise times Sunset times
Tuesday, 1st December 2020 06:59 16:20
Wednesday, 16th December 2020 07:12 16:21
Thursday, 31st December 2020 07:18 16:30
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Metric (°C / mm)  |  Imperial (°F / inches)

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