January weather forecast
Chicago, IL

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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

The beginning of the year brings brisk conditions to Chicago, Illinois, with an increased chance of snowfall. Marked by chilly days, this month is the epitome of a Midwestern winter, promising a snowy, frosted landscape. Visitors and locals see a noticeable drop in temperatures from December. January experiences snowfall for approximately 10.6 days with a total of 3.39" (86mm), providing a winter wonderland setting. Embrace the chilly winds and enjoy the seasonal activities like ice skating and festive markets.

Temperature

January, with its average high-temperature of 29.7°F (-1.3°C) and an average low-temperature of 20.7°F (-6.3°C), holds the record as the coldest month.

Humidity

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

Rainfall

In January, the rain falls for 6.6 days. Throughout January, 1.77" (45mm) of precipitation is accumulated. 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, snow falls for 10.6 days, with typically accumulated 3.39" (86mm) of snow. In Chicago, during the entire year, snow falls for 40.9 days and aggregates up to 13.9" (353mm) of snow.

Ocean temperature

In Chicago, in January, the average water temperature is 39°F (3.9°C).
Note: During swimming, this circumstance is both life-threatening and incredibly perilous. The intense cold sensation provokes rapid hyperventilation. The use of a specialized swimsuit is imperative to prevent thermal injuries.

Daylight

In January, the average length of the day is 9h and 33min.
On the first day of the month, sunrise is at 7:18 am and sunset at 4:29 pm. On the last day of January, in Chicago, sunrise is at 7:04 am and sunset at 5:03 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 are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for average individuals.
Note: In January, an average UV index of 1 transforms into the following instructions:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Updated: Jun 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest month?

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

How cold is it in January?

In January, in Chicago, 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?

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

What is the average humidity in January?

In January, the average relative humidity is 82%.

How much does it rain in January?

In Chicago, in January, during 6.6 rainfall days, 1.77" (45mm) of precipitation is typically accumulated.

How much does it snow in January?

In Chicago, Illinois, in January, during 10.6 snowfall days, 3.39" (86mm) of snow is typically accumulated.

What is the water temperature in January?

In January, the average ocean 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.

How many hours of daylight does Chicago have in January?

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

What time are sunrise and sunset in January?

In January, on the first day of the month, sunrise is at 7:18 am and sunset at 4:29 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 5:03 pm CST.

What is the month with the least sunshine?

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 January, the average sunshine duration is 3.7h.

When is the lowest UV index?

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

How high is the UV index in January?

In Chicago, the average daily maximum UV index in January is 1. A UV Index reading 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 daylight
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).

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).

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).

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%).

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").

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).

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").

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).

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).

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 3min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in January: 3h and 4min

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).

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).

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).

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).

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).

Chicago, Illinois, USA

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