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

Temperature

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

Humidity

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

Rainfall

In Chicago, in January, during 6.6 rainfall days, 1.77" (45mm) of precipitation is typically accumulated. In Chicago, during the entire year, the rain falls for 160.2 days and collects up to 36.97" (939mm) of precipitation.

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, in Chicago, there are 40.9 snowfall days, and 13.9" (353mm) of snow is accumulated.

Ocean temperature

In Chicago, the average seawater temperature in January is 39°F (3.9°C).
Note: For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. A specialized swimsuit is mandatory to reduce thermal damage.

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, sunrise is at 7:03 am and sunset at 5:04 pm CST.

Sunshine

January has the least sunshine of the year in Chicago, 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 of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 1 in January transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Chicago?

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

What is the most humid month in Chicago?

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

What is the average humidity in January in Chicago?

In January, the average relative humidity is 82%.

How much does it rain in Chicago in January?

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

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 life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. A specialized swimsuit is mandatory to reduce thermal damage.

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

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

What time 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, sunrise is at 7:03 am and sunset at 5:04 pm CST.

What is the month with the least sunshine in Chicago?

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

How long on average sun shines in January in Chicago?

The average sunshine duration in January in Chicago is 3.7h.

When is 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.

How high is the UV index in January in Chicago?

The average daily maximum UV index in January in Chicago, Illinois, is 1. A UV Index of 2, and less, symbolizes a low health threat from unsafe exposure to Sun's UV rays.

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"

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

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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: 3.7h

The 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

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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