December weather forecast
Aurora, IL

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The tranquil city of Aurora, Illinois, as set in the peaceful waterfront promenade and the cloudy sky reflected in the water below
The tranquil city of Aurora, Illinois, as set in the peaceful waterfront promenade and the cloudy sky reflected in the water below

Weather in December

December in Aurora, Illinois witnesses a full swing of winter with freezing temperatures. Compared to November, daylight hours decrease even further, contributing to the cold weather. Snowfall sees a significant increase, reaching an average of 0.55" (14mm). This increase confirms the transition from fall to winter. Despite the biting cold, the pressure stays relatively high, closing the year with typical Midwestern winter conditions.

Temperature

The arrival of December corresponds with a temperature reduction, down from November's frosty 45.5°F (7.5°C) to a cold 34.2°F (1.2°C). Aurora's temperature lowers to a mean of 23.9°F (-4.5°C) during the nights in December.

Humidity

The average relative humidity in December is 82%.

Rainfall

In Aurora, in December, during 6 rainfall days, 0.59" (15mm) of precipitation is typically accumulated. In Aurora, Illinois, during the entire year, the rain falls for 120.4 days and collects up to 12.32" (313mm) of precipitation.

Snowfall

Months with snowfall in Aurora are January through April, October through December. In Aurora, in December, during 6.4 snowfall days, 0.55" (14mm) of snow is typically accumulated. Throughout the year, there are 32.3 snowfall days, and 4.84" (123mm) of snow is accumulated.

Daylight

With an average of 9h and 12min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:01 am and sunset at 4:23 pm. On the last day of December, sunrise is at 7:20 am and sunset at 4:32 pm CST.

Sunshine

In December, the average sunshine is 4.2h.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Aurora. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for average individuals.
Note: An average maximum UV index of 1 in December leads to these recommendations:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
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Frequently asked questions

How cold is it in Aurora in December?

In Aurora, 34.2°F (1.2°C) is the average high-temperature and 23.9°F (-4.5°C) is the average low-temperature during December. In July, the average heat index (a.k.a. 'real feel', 'feels like'), which calculates the temperature value influenced by the moisture in the air, is estimated at 87.8°F (31°C).

What is the average humidity in December in Aurora?

In Aurora, the average relative humidity in December is 82%.

How many days does it rain in December in Aurora?

In Aurora, Illinois, in December, it is raining for 6 days, with typically 0.59" (15mm) of accumulated precipitation.

How much does it snow in Aurora in December?

In Aurora, in December, snow falls for 6.4 days, with typically accumulated 0.55" (14mm) of snow.

What is the month with the shortest days in Aurora?

December has the shortest days of the year in Aurora, Illinois, with an average of 9h and 12min of daylight.

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

In Aurora, the average day length in December is 9h and 13min.

What time are sunrise and sunset in December in Aurora?

In December, on the first day of the month, sunrise is at 7:01 am and sunset at 4:23 pm. On the last day of the month, in Aurora, Illinois, sunrise is at 7:20 am and sunset at 4:32 pm CST.

How many hours of sunshine does Aurora have in December?

In Aurora, Illinois, the average sunshine duration in December is 4.2h.

What is the month with the lowest UV index in Aurora?

The months with the lowest UV index in Aurora, Illinois, are January and December, with an average maximum UV index of 1.

How high is the UV index in December in Aurora?

In Aurora, the average daily maximum UV index in December is 1. A UV Index of 2, and less, symbolizes 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
Aurora, IL

Average temperature in December - Aurora, IL
  • Average high temperature in December: 34.2°F

The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (27.9°F).

  • Average low temperature in December: 23.9°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (16°F).

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Average pressure in December
Aurora, IL

Average pressure in December - Aurora, IL
  • Average pressure in December: 30.1"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
Aurora, IL

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

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

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Average humidity in December
Aurora, IL

Average humidity in December - Aurora, IL
  • Average humidity in December: 82%

The months with the highest relative humidity are January, February and July (83%).
The month with the lowest relative humidity is October (74%).

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Average rainfall in December
Aurora, IL

Average rainfall in December - Aurora, IL
  • Average rainfall in December: 0.59"

The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is February (0.51").

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Average rainfall days in December
Aurora, IL

Average rainfall days in December - Aurora, IL
  • Average rainfall days in December: 6 days

The month with the highest number of rainy days is June (15.5 days).
The month with the least rainy days is January (4.3 days).

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Average snowfall in December
Aurora, IL

Average snowfall in December - Aurora, IL
  • Average snowfall in December: 0.55"

The month with the highest snowfall is January (1.69").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Aurora, IL

Average snowfall days in December - Aurora, IL
  • Average snowfall days in December: 6.4 days

The month with the highest number of snowfall days is January (9.1 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
Aurora, IL

Average daylight in December / Average sunshine in December - Aurora, 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 July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

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Average sunshine days in December
Aurora, IL

Average sunshine days in December - Aurora, IL
  • Average sunshine days in December: 20.5 days

The month with the most sunshine days is December (20.5 days).
The month with the least sunshine days is June (11.4 days).

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Average UV index in December
Aurora, IL

Average UV index in December - Aurora, IL
  • Average UV index in December: 1

The months with the highest UV index are June and July (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
Aurora, IL

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

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

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Average visibility in December
Aurora, IL

Average visibility in December - Aurora, 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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Aurora, Illinois, USA

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