Chicago
Illinois, USA
Long-term weather forecast
Long-term weather forecast
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December weather forecast and Climate
Chicago, IL

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An aerial view of the city of Chicago in Illinois, on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street
An aerial view of the city of Chicago in Illinois, on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street
December is the start of the cold winter in Chicago with the first substantial snowfall. The average temperatures are in the freezing 21°F (-6.1°C) to 35°F (1.7°C) range; a few nights register below 10°F (-12.2°C), and one or two even drop below 0°F (-17.8°C).
Snowfall registers on average 8.5" (215.9mm) accompanied by 2.3" (58.4mm) of icy rain. The daily sunshine reduces to 4 hours with short days of 9 hours in December. Dense fog routinely spills due to the lake breezes, as cloudy skies become the norm of the day.
Layer up, as December is the windiest month of the year in Chicago.
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  • The average high temperature in December: 1.8°C

The warmest month (with the highest average high temperature) is July (29°C).
The month with the lowest average high temperature is January (-0.3°C).

  • The average low temperature in December: -5.2°C

The month with the highest average low temperature is July (19.7°C).
The coldest month (with the lowest average low temperature) is January (-7.7°C).

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  • The average humidity in December: 75.5%

The month with the highest relative humidity is December (75.5%).
The month with the lowest relative humidity is May (64.1%).

  • The average rainfall in December: 65.3mm

The wettest month (with the highest rainfall) is May (104.9mm).
The driest month (with the lowest rainfall) is February (49.3mm).

  • The average rainfall days in December: 11.1 days

The month with the highest number of rainy days is May (11.4 days).
The month with the lowest number of rainy days is September (8.2 days).

  • The average snowfall in December: 221mm

The month with the highest snowfall is January (292.1mm).
Months with the lowest snowfall are May, June, July, August and September (0mm).

  • The average snowfall days in December: 6.7 days

The month with the highest number of snowfall days is January (8.1 days).
Months with the lowest number of snowfall days are May, June, July, August and September (0 days).

  • The average sea temperature in December: 5.8°C

The best month for swimming (with the highest average sea temperature) is August (23.3°C).
The coldest month (with the lowest average sea temperature) is February (2.7°C).

  • The average daylight in December: 9h

Months with the longest days are May, June and July (Average daylight: 15h).
The month with shortest days is December (Average daylight: 9h).

  • The average sunshine in December: 3.4h

The month with most sunshine is June (Average sunshine: 10.4h).
The month with least sunshine is December (Average sunshine: 3.4h).

  • The average UV index in December: 1

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January and December (UV index 1).

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