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

Humidity

The average relative humidity in December is 80%.

Rainfall

December is the month with the least rainfall. Rain falls for 8.8 days and accumulates 1.65" (42mm) of precipitation.

Snowfall

January through May, November and December are months with snowfall in Chicago. In Chicago, in December, snow falls for 7.5 days, with typically accumulated 2.52" (64mm) 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 December, the average water temperature is 42.4°F (5.8°C).
Note: Swimming in 42.4°F (5.8°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

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

Sunshine

In December, the average sunshine 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 of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, the average maximum UV index of 1 translate into the following recommendations:
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 average humidity in December in Chicago?

The average relative humidity in December in Chicago is 80%.

What is the driest month in Chicago?

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

How many days does it rain in December in Chicago?

In Chicago, during December, the rain falls for 8.8 days and regularly aggregates up to 1.65" (42mm) of precipitation.

How much does it snow in Chicago in December?

In Chicago, Illinois, during December, snow falls for 7.5 days and regularly aggregates up to 2.52" (64mm) of snow.

How cold is the water in December in Chicago?

In Chicago, Illinois, in December, the average water temperature is 42.4°F (5.8°C). Swimming in 42.4°F (5.8°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the month with the shortest days in Chicago?

The month with the shortest days is December, with an average of 9h and 11min of daylight.

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

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

What time are sunrise and 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?

In December, the average sunshine duration in Chicago 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.

How high is the UV index in December in Chicago?

In Chicago, the average daily maximum UV index in December is 1. A UV Index value of 2, and less, symbolizes a minimal hazard to health from unsafe exposure to Sun's UV rays.

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"

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 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

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 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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