December weather forecast
Wheaton, IL

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Weather in December

December in Wheaton brings about full-fledged winter conditions. The snow-filled, chilly December weather is characterized by temperatures alternating between a high of 34.3°F (1.3°C) and a low of 24.3°F (-4.3°C). Snowfall becomes a regular occurrence again, with December's average snowfall at 3.03" (77mm). However, the cloud percentage jumps to 58, indicating overcast sky for most of the month. Despite being the year's coldest month, December holds its charm with Christmas festivities.

Temperature

The arrival of December corresponds with a temperature reduction, down from November's chilly 45.5°F (7.5°C) to a wintry 34.3°F (1.3°C). The nighttime temperature in Wheaton, during December, averages of 24.3°F (-4.3°C).

Humidity

In Wheaton, the average relative humidity in December is 81%.

Rainfall

The months with the least rainfall are November and December Rain falls for 7.8 days and accumulates 1.65" (42mm) of rain.

Snowfall

January through May, October through December are months with snowfall. In December, it is snowing for 9.7 days. Throughout December, 3.03" (77mm) of snow is accumulated. In Wheaton, Illinois, during the entire year, snow falls for 47 days and aggregates up to 20.2" (513mm) of snow.

Daylight

With an average of 9h and 12min of daylight, December has the shortest days of the year in Wheaton.
On the first day of the month, sunrise is at 7:01 am and sunset at 4:22 pm. On the last day of December, sunrise is at 7:19 am and sunset at 4:31 pm CST.

Sunshine

In December, the average sunshine in Wheaton is 4.1h.

UV index

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In December, a daily UV index of 2 turns into the following recommendations:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
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Frequently asked questions

How cold is it in Wheaton in December?

In Wheaton, 34.3°F (1.3°C) is the average high-temperature and 24.3°F (-4.3°C) is the average low-temperature during December. In July, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, is appraised at 87.8°F (31°C).

What is the average humidity in December in Wheaton?

The average relative humidity in December in Wheaton, Illinois, is 81%.

What is the driest month in Wheaton?

The months with the least rainfall in Wheaton, Illinois, are November and December Rain falls for 7.8 days and accumulates 1.65" (42mm) of rain.

How much does it rain in Wheaton in December?

In Wheaton, in December, during 7.8 rainfall days, 1.65" (42mm) of precipitation is typically accumulated.

How many days does it snow in December in Wheaton?

In Wheaton, Illinois, during December, snow falls for 9.7 days and regularly aggregates up to 3.03" (77mm) of snow.

What is the month with the shortest days in Wheaton?

With an average of 9h and 12min of daylight, December has the shortest days of the year in Wheaton.

How many hours of daylight does Wheaton have in December?

The average day length in December in Wheaton is 9h and 11min.

When are sunrise and sunset in December in Wheaton?

On the first day of December, sunrise is at 7:01 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:31 pm CST.

How many hours of sunshine does Wheaton have in December?

In December, the average sunshine duration in Wheaton is 4.1h.

What is the UV index intensity in December in Wheaton?

In Wheaton, Illinois, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation.
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
Wheaton, IL

Average temperature in December - Wheaton, IL
  • Average high temperature in December: 34.3°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28°F).

  • Average low temperature in December: 24.3°F

The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).

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Average pressure in December
Wheaton, IL

Average pressure in December - Wheaton, 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
Wheaton, IL

Average wind speed in December - Wheaton, IL
  • Average wind speed in December: 9.1mph

The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is August (6mph).

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Average humidity in December
Wheaton, IL

Average humidity in December - Wheaton, IL
  • Average humidity in December: 81%

The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (73%).

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Average rainfall in December
Wheaton, IL

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

The wettest month (with the highest rainfall) is May (4.45").
The driest months (with the least rainfall) are November and December (1.65").

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Average rainfall days in December
Wheaton, IL

Average rainfall days in December - Wheaton, IL
  • Average rainfall days in December: 7.8 days

The month with the highest number of rainy days is July (20.1 days).
The month with the least rainy days is February (5.8 days).

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Average snowfall in December
Wheaton, IL

Average snowfall in December - Wheaton, IL
  • Average snowfall in December: 3.03"

The month with the highest snowfall is January (5.87").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Wheaton, IL

Average snowfall days in December - Wheaton, IL
  • Average snowfall days in December: 9.7 days

The month with the highest number of snowfall days is January (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Wheaton, IL
  • Average daylight in December: 9h and 1min

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 December: 4h and 1min

The month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days in December
Wheaton, IL

Average sunshine days in December - Wheaton, IL
  • Average sunshine days in December: 15.7 days

The month with the most sunshine days is November (16.1 days).
The month with the least sunshine days is July (8.2 days).

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Average UV index in December
Wheaton, IL

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

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).

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Average cloud cover in December
Wheaton, IL

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

The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are August and September (Cloud cover 32).

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Average visibility in December
Wheaton, IL

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

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

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Wheaton, Illinois, USA

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