January weather forecast and climate
Chicago, IL

The city of Chicago in Illinois on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street
The city of Chicago in Illinois on the shores of Lake Michigan, with a superb view of the sandy beach of Oak Street

Weather in January

January, like December, is another subzero cold winter month in Chicago, Illinois, with average temperature ranging between max 29.7°F (-1.3°C) and min 20.7°F (-6.3°C).

Temperature

With an average high-temperature of 29.7°F (-1.3°C) and an average low-temperature of 20.7°F (-6.3°C), January is the coldest month.

Humidity

January is the most humid month in Chicago, Illinois, with an average relative humidity of 82%.

Rainfall

In Chicago, during January, the rain falls for 6.6 days and regularly aggregates up to 1.77" (45mm) of precipitation. Throughout the year, in Chicago, there are 160.2 rainfall days, and 36.97" (939mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, November and December. In January, it is snowing for 10.6 days. Throughout January, 3.39" (86mm) of snow is accumulated. Throughout the year, there are 40.9 snowfall days, and 13.9" (353mm) of snow is accumulated.

Ocean temperature

In Chicago, the average seawater temperature is 39°F (3.9°C).
Note: For swimming, this is considered extremely cold, dangerous, and life-threatening. Unless suitably protected with insulated waterproof clothing, hypothermia quickly occurs.

Daylight

In Chicago, the average length of the day in January is 9.5h.

Sunshine

January has the least sunshine of the year, with an average of 3.7h of sunshine.

UV index

Months with the lowest UV index in Chicago are January and December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability from the exposure to the Sun's UV rays for the average person.
Note: In January, the average maximum UV index of 1 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Chicago?

With an average high-temperature of 29.7°F (-1.3°C) and an average low-temperature of 20.7°F (-6.3°C), January is the coldest month in Chicago.

What is the temperature in January in Chicago?

The average high-temperature, in January, is 29.7°F (-1.3°C), while the average low-temperature is 20.7°F (-6.3°C).

What is the most humid month in Chicago?

With an average relative humidity of 82%, January is the most humid month in Chicago, Illinois.

What is the average humidity in January in Chicago?

In January, the average relative humidity is 82%.

How many days does it rain in January in Chicago?

In January, the rain falls for 6.6 days. Throughout January, 1.77" (45mm) of precipitation is accumulated.

How many days does it snow in January in Chicago?

In Chicago, in January, snow falls for 10.6 days, with typically accumulated 3.39" (86mm) of snow.

How cold is the water in January in Chicago?

In Chicago, Illinois, in January, the average water temperature is 39°F (3.9°C). For swimming, this is considered extremely cold, dangerous, and life-threatening. Unless suitably protected with insulated waterproof clothing, hypothermia quickly occurs.

How many hours of daylight does Chicago have in January?

In Chicago, Illinois, the average length of the day in January is 9.5h.

What is the month with the least sunshine in Chicago?

January has the least sunshine of the year, with an average of 3.7h of sunshine.

How long on average sun shines in January in Chicago?

In January, the average sunshine in Chicago is 3.7h.

What are the months with the lowest UV index in Chicago?

January and December, with an average maximum UV index of 1, are months with the lowest UV index.

What is the UV index reading in January in Chicago?

In Chicago, the average daily maximum UV index in January is 1. A UV Index estimate of 2, and below, represents a minimal hazard to health from unprotected exposure to the UV radiation.

Average temperature in January
Chicago, IL

Average temperature in January - Chicago, IL
  • Average high temperature in January: -1.3°C

The warmest month (with the highest average high temperature) is August (25.3°C).
The month with the lowest average high temperature is January (-1.3°C).

  • Average low temperature in January: -6.3°C

The month with the highest average low temperature is July (19.9°C).
The coldest month (with the lowest average low temperature) is January (-6.3°C).

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Average pressure in January
Chicago, IL

Average pressure in January - Chicago, IL
  • Average pressure in January: 1019.5mbar

The month with the highest atmospheric pressure is January (1019.5mbar).
The month with the lowest atmospheric pressure is June (1013.3mbar).

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Average wind speed in January
Chicago, IL

Average wind speed in January - Chicago, IL
  • Average wind speed in January: 20.1km/h

The windiest month (with the highest average wind speed) is January (20.1km/h).
The calmest month (with the lowest average wind speed) is July (12.4km/h).

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Average humidity in January
Chicago, IL

Average humidity in January - Chicago, IL
  • Average humidity in January: 82%

The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (73%).

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Average rainfall in January
Chicago, IL

Average rainfall in January - Chicago, IL
  • Average rainfall in January: 45mm

The wettest month (with the highest rainfall) is June (124mm).
The driest month (with the least rainfall) is December (42mm).

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Average rainfall days in January
Chicago, IL

Average rainfall days in January - Chicago, IL
  • Average rainfall days in January: 6.6 days

The month with the highest number of rainy days is July (18.5 days).
The month with the least rainy days is February (5.5 days).

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Average snowfall in January
Chicago, IL

Average snowfall in January - Chicago, IL
  • Average snowfall in January: 86mm

The month with the highest snowfall is February (90mm).
Months with the least snowfall are June, July, August, September and October (0mm).

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Average snowfall days in January
Chicago, IL

Average snowfall days in January - Chicago, IL
  • Average snowfall days in January: 10.6 days

The month with the highest number of snowfall days is January (10.6 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in January
Chicago, IL

Average sea temperature in January - Chicago, IL
  • 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).

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Average daylight in January /
Average sunshine in January
Chicago, IL

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 the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in January: 3.7h

Months with the most sunshine are July and August (Average sunshine: 10.6h).
The month with the least sunshine is January (Average sunshine: 3.7h).

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Average sunshine days in January
Chicago, IL

Average sunshine days in January - Chicago, IL
  • Average sunshine days in January: 13.6 days

The month with the most sunshine days is December (15.5 days).
The month with the least sunshine days is July (9.3 days).

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Average UV index in January
Chicago, IL

Average UV index in January - Chicago, IL
  • Average UV index in January: 1

Months with the highest UV index are July and August (UV index 6).
Months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in January
Chicago, IL

Average cloud cover in January - Chicago, IL
  • Average cloud cover in January: 62

The month with the most cloud cover is January (Cloud cover 62).
Months with the least cloud cover are July and August (Cloud cover 27).

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Average visibility in January
Chicago, IL

Average visibility in January - Chicago, IL
  • Average visibility in January: 9km

Months with the highest visibility are September and October (10km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, November and December (9km).

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