December 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 December

December, the first month of the winter in Chicago, is also a wintry month, with temperature in the range of an average low of 27.9°F (-2.3°C) and an average high of 35.8°F (2.1°C).

Temperature

In Chicago, the average high-temperature in December drops from a chilly 46°F (7.8°C) in November to a wintry 35.8°F (2.1°C). In December, in Chicago, the average low-temperature is 27.9°F (-2.3°C).

Humidity

In December, the average relative humidity is 80%.

Rainfall

The month with the least rainfall in Chicago is December, when the rain falls for 8.8 days and typically collects 1.65" (42mm) of precipitation.

Snowfall

January through May, November and December are months with snowfall. In December, it is snowing for 7.5 days. Throughout December, 2.52" (64mm) of snow is accumulated. 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 December, the average water temperature is 42.4°F (5.8°C).
Note: Swimming in 42.4°F (5.8°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

December has the shortest days of the year, with an average of 9h and 11min of daylight.
On the first day of December, sunrise is at 6:58 am and sunset at 4:20 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:29 pm CST.

Sunshine

In December, the average sunshine in Chicago is 4h.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, the average maximum UV index of 1 translate into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to 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. 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 temperature in December in Chicago?

In Chicago, in December, the average high-temperature is 35.8°F (2.1°C), and the average low-temperature is 27.9°F (-2.3°C).

What is the average humidity in December in Chicago?

In December, the average relative humidity in Chicago is 80%.

What is the driest month in Chicago?

The month with the least rainfall in Chicago is December, when the rain falls for 8.8 days and typically collects 1.65" (42mm) of precipitation.

How much does it rain in Chicago in December?

In Chicago, Illinois, in December, during 8.8 rainfall days, 1.65" (42mm) of precipitation is typically accumulated.

How many days does it snow in December in Chicago?

In December, in Chicago, it is snowing for 7.5 days. Throughout December, 2.52" (64mm) of snow is accumulated.

What is the water temperature in December in Chicago?

In Chicago, Illinois, the average seawater temperature in December is 42.4°F (5.8°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the month with the shortest days in Chicago?

December has the shortest days of the year in Chicago, Illinois, with an average of 9h and 11min of daylight.

How many hours of daylight does Chicago have in December?

In Chicago, the average day length in December is 9h and 11min.

When is the sunrise / sunset in December in Chicago?

In December, on the first day of the month, sunrise is at 6:58 am and sunset at 4:20 pm. On the last day of the month, in Chicago, Illinois, sunrise is at 7:17 am and sunset at 4:29 pm CST.

How many hours of sunshine does Chicago have in December?

The average sunshine duration in December is 4h.

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, Illinois.

What is the UV index reading in December in Chicago?

In Chicago, Illinois, the average daily maximum UV index in December 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 December
Chicago, IL

Average temperature in December - Chicago, IL
  • Average high temperature in December: 35.8°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 December: 27.9°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 December
Chicago, IL

Average pressure in December - Chicago, IL
  • Average pressure in December: 30.09"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 December
Chicago, IL

Average wind speed in December - Chicago, IL
  • Average wind speed in December: 11.7mph

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 December
Chicago, IL

Average humidity in December - Chicago, IL
  • Average humidity in December: 80%

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 December
Chicago, IL

Average rainfall in December - Chicago, IL
  • Average rainfall in December: 1.65"

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 December
Chicago, IL

Average rainfall days in December - Chicago, IL
  • Average rainfall days in December: 8.8 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 December
Chicago, IL

Average snowfall in December - Chicago, IL
  • Average snowfall in December: 2.52"

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 December
Chicago, IL

Average snowfall days in December - Chicago, IL
  • Average snowfall days in December: 7.5 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 December
Chicago, IL

Average sea temperature in December - Chicago, IL
  • Average sea temperature in December: 42.4°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 December /
Average sunshine in December
Chicago, IL

Average daylight in December / Average sunshine in December - Chicago, IL
  • Average daylight in December: 9h and 11min

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 December: 4h and 0min

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 December
Chicago, IL

Average sunshine days in December - Chicago, IL
  • Average sunshine days in December: 15.5 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 December
Chicago, IL

Average UV index in December - Chicago, IL
  • Average UV index in December: 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 December
Chicago, IL

Average cloud cover in December - Chicago, IL
  • Average cloud cover in December: 58

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 December
Chicago, IL

Average visibility in December - Chicago, IL
  • Average visibility in December: 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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