January weather forecast
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, the same as December, in Chicago, Illinois, is another subzero cold winter month, with an average temperature varying between 29.7°F (-1.3°C) and 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

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

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, there are 160.2 rainfall days, and 36.97" (939mm) of precipitation is accumulated.

Snowfall

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

Ocean temperature

In Chicago, the average water 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 9h and 33min.
On the first day of the month, sunrise is at 7:18 am and sunset at 4:30 pm. On the last day of January, in Chicago, sunrise is at 7:03 am and sunset at 5:04 pm CST.

Sunshine

The month with the least sunshine is January, with an average of 3.7h of sunshine.

UV index

The months with the lowest UV index in Chicago are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 1 in January interpret into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the 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.

What is the temperature in January in Chicago?

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

What is the most humid month in Chicago?

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

What is the average humidity in January in Chicago?

In January, the average relative humidity in Chicago, Illinois, is 82%.

How many days does it rain in January in Chicago?

In Chicago, in January, it is raining for 6.6 days, with typically 1.77" (45mm) of accumulated precipitation.

How much does it snow in Chicago in January?

In Chicago, during January, snow falls for 10.6 days and regularly aggregates up to 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 very dangerous and immediately life-threatening. Total loss of breathing control instantly occurs, and clear thinking becomes almost impossible. A specialized swimsuit is obligatory to minimize thermal loss.

What is the average length of the day in January in Chicago?

In January, the average day length in Chicago, Illinois, is 9h and 33min.

When are sunrise and sunset in January in Chicago?

In January, on the first day of the month, sunrise is at 7:18 am and sunset at 4:30 pm. On the last day of the month, in Chicago, Illinois, sunrise is at 7:03 am and sunset at 5:04 pm CST.

What is the month with the least sunshine in Chicago?

With an average of 3.7h of sunshine, January has the least sunshine of the year in Chicago.

How long on average sun shines in January in Chicago?

In Chicago, Illinois, the average sunshine duration in January 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 in Chicago, Illinois.

What is the UV index reading in January in Chicago?

In January, the average daily maximum UV index is 1. A UV Index estimate of 2, and below, represents a low health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Chicago, IL

Average temperature in January - Chicago, IL
  • Average high temperature in January: 29.7°F

The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in January: 20.7°F

The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).

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Average pressure in January
Chicago, IL

Average pressure in January - Chicago, IL
  • Average pressure in January: 30.11"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in January
Chicago, IL

Average wind speed in January - Chicago, IL
  • Average wind speed in January: 12.5mph

The windiest month (with the highest average wind speed) is January (12.5mph).
The calmest month (with the lowest average wind speed) is July (7.7mph).

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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: 1.77"

The wettest month (with the highest rainfall) is June (4.88").
The driest month (with the least rainfall) is December (1.65").

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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: 3.39"

The month with the highest snowfall is February (3.54").
The months with the least snowfall are June, July, August, September and October (0").

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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).
The 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: 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).

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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: 9h and 33min

The month with the longest days is June (Average daylight: 15h and 11min).
The month with the shortest days is December (Average daylight: 9h and 11min).

  • Average sunshine in January: 3h and 42min

The months with the most sunshine are July and August (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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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

The months with the highest UV index are July and August (UV index 6).
The 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).
The 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: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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