December weather forecast
Cottage Hills, IL

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Weather in December

The first month of the winter, December, is also a wintry month in Cottage Hills, Illinois, with an average temperature fluctuating between 29.8°F (-1.2°C) and 41.4°F (5.2°C).

Temperature

The transition into December is accompanied by a temperature decrease, with the average high-temperature shifting from a cool 52.2°F (11.2°C) in November to a cold 41.4°F (5.2°C). The month of December records an average low-temperature of 29.8°F (-1.2°C).

Humidity

In December, the average relative humidity is 77%.

Rainfall

In Cottage Hills, in December, it is raining for 6.7 days, with typically 1.38" (35mm) of accumulated precipitation. Throughout the year, there are 138 rainfall days, and 23.9" (607mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. In Cottage Hills, in December, during 3.8 snowfall days, 0.91" (23mm) of snow is typically accumulated. Throughout the year, there are 18.6 snowfall days, and 4.53" (115mm) of snow is accumulated.

Daylight

With an average of 9h and 30min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:00 am and sunset at 4:38 pm. On the last day of December, sunrise is at 7:18 am and sunset at 4:48 pm CST.

Sunshine

The average sunshine in December is 4.8h.

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 threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum UV index of 2 during December leads to these instructions:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Updated: Jul 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December in Cottage Hills?

December temperatures vary between a high-temperature of 41.4°F (5.2°C) and a low-temperature of 29.8°F (-1.2°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in August is calculated to be 93.2°F (34°C).

What is the average humidity in December in Cottage Hills?

The average relative humidity in December is 77%.

How much does it rain in December?

In Cottage Hills, in December, during 6.7 rainfall days, 1.38" (35mm) of precipitation is typically accumulated.

How many days does it snow in December?

In December, it is snowing for 3.8 days. Throughout December, 0.91" (23mm) of snow is accumulated.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 30min of daylight.

How many hours of daylight does Cottage Hills have in December?

In Cottage Hills, the average day length in December is 9h and 29min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:00 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:48 pm CST.

How many hours of sunshine does Cottage Hills have in December?

The average sunshine duration in December is 4.8h.

When is the lowest UV index?

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

How high is the UV index in December?

In Cottage Hills, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health risk from unprotected exposure to 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
Cottage Hills, IL

Average temperature in December - Cottage Hills, IL
  • Average high temperature in December: 41.4°F

The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (36.1°F).

  • Average low temperature in December: 29.8°F

The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).

Average pressure in December
Cottage Hills, IL

Average pressure in December - Cottage Hills, IL
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in December
Cottage Hills, IL

Average wind speed in December - Cottage Hills, IL
  • Average wind speed in December: 9mph

The windiest months (with the highest average wind speed) are January and February (9.6mph).
The calmest month (with the lowest average wind speed) is July (5.7mph).

Average humidity in December
Cottage Hills, IL

Average humidity in December - Cottage Hills, IL
  • Average humidity in December: 77%

The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Cottage Hills, IL

Average rainfall in December - Cottage Hills, IL
  • Average rainfall in December: 1.38"

The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is February (1.14").

Average rainfall days in December
Cottage Hills, IL

Average rainfall days in December - Cottage Hills, IL
  • Average rainfall days in December: 6.7 days

The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is January (5.6 days).

Average snowfall in December
Cottage Hills, IL

Average snowfall in December - Cottage Hills, IL
  • Average snowfall in December: 0.91"

The month with the highest snowfall is February (1.61").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Cottage Hills, IL

Average snowfall days in December - Cottage Hills, IL
  • Average snowfall days in December: 3.8 days

The month with the highest number of snowfall days is January (6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Cottage Hills, IL

Average daylight in December / Average sunshine in December - Cottage Hills, IL
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is June (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 30min).

Average sunshine days in December
Cottage Hills, IL

Average sunshine days in December - Cottage Hills, IL
  • Average sunshine days in December: 20.4 days

The month with the most sunshine days is December (20.4 days).
The month with the least sunshine days is July (12.3 days).

Average UV index in December
Cottage Hills, IL

Average UV index in December - Cottage Hills, IL
  • Average UV index in December: 2

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

Average cloud cover in December
Cottage Hills, IL

Average cloud cover in December - Cottage Hills, IL
  • Average cloud cover in December: 49

The month with the most cloud cover is January (Cloud cover 51).
The months with the least cloud cover are June, July and August (Cloud cover 29).

Average visibility in December
Cottage Hills, IL

Average visibility in December - Cottage Hills, 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).

Cottage Hills, Illinois, USA

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