Chicago
Illinois, USA
Long-term weather forecast
Long-term weather forecast
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January 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
January is usually the coldest, snowiest, and driest month in Chicago. The average temperatures are in the frigid zone of 17°F (-8.3°C) to 31°F (-0.6°C) - most of the days remain below the freezing temperature of 32°F (0°C), while nights range in the -10°F (-23.3°C) to 10°F (-12.2°C).
Snowfall is 10.8" (274.3mm) as many days receive a fresh amount, while rainfall registers only 1.7" (43.2mm). By the end of January, daylight improves to 10 hours - an unusual snowstorm is likely to step in the city. The ground is usually white with a layer of 5" (127mm) of snow as the New Year bells ring in Chicago.
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  • The average high temperature in January: -0.3°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 January: -7.7°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 January: 72.2%

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 January: 52.3mm

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 January: 10.7 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 January: 292.1mm

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 January: 8.1 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 January: 3.9°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 January: 10h

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 January: 4.4h

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 January: 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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