January weather forecast and climate
Chicago, IL

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.

What is the coldest month in Chicago?

With an average high-temperature of 31.5°F (-0.3°C) and an average low-temperature of 18.1°F (-7.7°C), January is the coldest month in Chicago, Illinois.

What is the average temperature in January in Chicago?

In Chicago, Illinois, in January, the average high-temperature is 31.5°F (-0.3°C), and the average low-temperature is 18.1°F (-7.7°C).
Average temperature in January - Chicago, IL
  • Average high temperature in January: 31.5°F

The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (31.5°F).

  • Average low temperature in January: 18.2°F

The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (18.2°F).

Average humidity in January - Chicago, IL
  • 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%).

Average rainfall in January - Chicago, IL
  • Average rainfall in January: 2.1"

Wettest months (with the highest rainfall) are May and June (4.1").
The driest month (with the lowest rainfall) is February (1.9").

Average rainfall days in January - Chicago, IL
  • 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).

Average snowfall in January - Chicago, IL
  • Average snowfall in January: 11.5"

The month with the highest snowfall is January (11.5").
Months with the lowest snowfall are May, June, July, August and September (0").

Average snowfall days in January - Chicago, IL
  • 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).

Average sea temperature in January - Chicago, IL
  • Average sea temperature in January: 39°F

The best month for swimming (with the highest average sea temperature) is August (73.9°F).
The coldest month (with the lowest average sea temperature) is February (36.9°F).

Average daylight in January / Average sunshine in January - Chicago, IL
  • Average daylight in January: 9.5h

The month with the longest days is June (Average daylight: 15.2h).
The month with shortest days is December (Average daylight: 9.2h).

  • 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).

Average UV index in January - Chicago, IL
  • 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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