December weather forecast
Champaign, IL

An old building that works as an auditorium within the University of Illinois in Champaign
An old building that works as an auditorium within the University of Illinois in Champaign

Weather in December

December, the first month of the winter in Champaign, is also a wintry month, with an average temperature fluctuating between 27.7°F (-2.4°C) and 37.6°F (3.1°C).

Temperature

In December, the average high-temperature decreases from a frosty 49.1°F (9.5°C) in November to a cold 37.6°F (3.1°C). In December, in Champaign, the average low-temperature is 27.7°F (-2.4°C).

Humidity

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

Rainfall

In Champaign, during December, the rain falls for 7 days and regularly aggregates up to 0.98" (25mm) of precipitation. Throughout the year, there are 129.9 rainfall days, and 18.15" (461mm) of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall in Champaign. In December, it is snowing for 5.9 days. Throughout December, 1.1" (28mm) of snow is accumulated. In Champaign, Illinois, during the entire year, snow falls for 27.1 days and aggregates up to 5.91" (150mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 22min of daylight.
On the first day of the month, sunrise is at 6:56 am and sunset at 4:28 pm. On the last day of December, sunrise is at 7:14 am and sunset at 4:37 pm CST.

Sunshine

In Champaign, Illinois, the average sunshine in December is 4.5h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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. 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 Champaign?

The average relative humidity in December in Champaign, Illinois, is 80%.

How many days does it rain in December in Champaign?

In Champaign, in December, during 7 rainfall days, 0.98" (25mm) of precipitation is typically accumulated.

How much does it snow in Champaign in December?

In Champaign, during December, snow falls for 5.9 days and regularly aggregates up to 1.1" (28mm) of snow.

What is the month with the shortest days in Champaign?

With an average of 9h and 22min of daylight, December has the shortest days of the year in Champaign, Illinois.

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

In Champaign, Illinois, the average day length in December is 9h and 22min.

When are sunrise and sunset in December in Champaign?

In December, on the first day of the month, sunrise is at 6:56 am and sunset at 4:28 pm. On the last day of the month, in Champaign, Illinois, sunrise is at 7:14 am and sunset at 4:37 pm CST.

How long on average sun shines in December in Champaign?

In December, the average sunshine duration in Champaign is 4.5h.

When is the lowest UV index in Champaign?

The months with the lowest UV index in Champaign, Illinois, are January, February, November and December, with an average maximum UV index of 2.

What is the UV index intensity in December in Champaign?

In December, the average daily maximum UV index in Champaign, Illinois, is 2. A UV Index estimate of 2, and below, represents a low health threat from exposure to Sun's UV rays.

Average temperature in December
Champaign, IL

Average temperature in December - Champaign, IL
  • Average high temperature in December: 37.6°F

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.8°F).

  • Average low temperature in December: 27.7°F

The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (20.5°F).

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Average pressure in December
Champaign, IL

Average pressure in December - Champaign, IL
  • Average pressure in December: 30.12"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in December
Champaign, IL

Average wind speed in December - Champaign, IL
  • Average wind speed in December: 10.1mph

The windiest month (with the highest average wind speed) is January (10.8mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).

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Average humidity in December
Champaign, IL

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

The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in December
Champaign, IL

Average rainfall in December - Champaign, IL
  • Average rainfall in December: 0.98"

The wettest month (with the highest rainfall) is April (2.24").
The driest month (with the least rainfall) is September (0.94").

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Average rainfall days in December
Champaign, IL

Average rainfall days in December - Champaign, IL
  • Average rainfall days in December: 7 days

The month with the highest number of rainy days is May (15.3 days).
The months with the least rainy days are January and February (6 days).

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Average snowfall in December
Champaign, IL

Average snowfall in December - Champaign, IL
  • Average snowfall in December: 1.1"

The month with the highest snowfall is January (1.85").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Champaign, IL

Average snowfall days in December - Champaign, IL
  • Average snowfall days in December: 5.9 days

The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Champaign, IL

Average daylight in December / Average sunshine in December - Champaign, IL
  • Average daylight in December: 9h and 22min

The month with the longest days is June (Average daylight: 14h and 59min).
The month with the shortest days is December (Average daylight: 9h and 22min).

  • Average sunshine in December: 4.5h

The month with the most sunshine is June (Average sunshine: 10.2h).
The month with the least sunshine is January (Average sunshine: 4h).

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Average sunshine days in December
Champaign, IL

Average sunshine days in December - Champaign, IL
  • Average sunshine days in December: 18.5 days

The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is July (11.8 days).

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Average UV index in December
Champaign, IL

Average UV index in December - Champaign, IL
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in December
Champaign, IL

Average cloud cover in December - Champaign, IL
  • Average cloud cover in December: 54

The month with the most cloud cover is January (Cloud cover 57).
The months with the least cloud cover are August and September (Cloud cover 31).

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Average visibility in December
Champaign, IL

Average visibility in December - Champaign, IL
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).

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