December weather forecast
Grant Park, IL

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Weather in December

The first month of the winter, December, is still a cold month in Grant Park, Illinois, with an average temperature varying between 25.7°F (-3.5°C) and 36.1°F (2.3°C).

Temperature

In December, the average high-temperature decreases from a frosty 47.3°F (8.5°C) in November to a cold 36.1°F (2.3°C). Grant Park, in December, witnesses an average low-temperature of 25.7°F (-3.5°C).

Humidity

In December, the average relative humidity is 81%.

Rainfall

In Grant Park, during December, the rain falls for 7 days and regularly aggregates up to 0.79" (20mm) of precipitation. Throughout the year, there are 132 rainfall days, and 15.16" (385mm) of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall. In Grant Park, in December, snow falls for 7.5 days, with typically accumulated 0.87" (22mm) of snow. Throughout the year, there are 36.5 snowfall days, and 5.28" (134mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 18min of daylight.
On the first day of the month, sunrise is at 6:57 am and sunset at 4:22 pm. On the last day of December, sunrise is at 7:16 am and sunset at 4:31 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. 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 1 turns into the following recommendations:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.

Frequently asked questions

How cold is December?

The average high-temperature and low-temperature during December are 36.1°F (2.3°C) and 25.7°F (-3.5°C) respectively. The average heat index (a.k.a. 'apparent temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in July is computed to be 87.8°F (31°C).

What is the average humidity in December?

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

How many days does it rain in December?

In Grant Park, during December, the rain falls for 7 days and regularly aggregates up to 0.79" (20mm) of precipitation.

How much does it snow in December?

In Grant Park, during December, snow falls for 7.5 days and regularly aggregates up to 0.87" (22mm) of snow.

What is the month with the shortest days?

With an average of 9h and 18min of daylight, December has the shortest days of the year in Grant Park.

How many hours of daylight does Grant Park have in December?

The average day length in December is 9h and 16min.

When are sunrise and sunset in December?

On the first day of December in Grant Park, sunrise is at 6:57 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 4:31 pm CST.

How many hours of sunshine does Grant Park have in December?

The average sunshine duration in December is 4.2h.

What are the months with the lowest UV index?

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

What is the UV index intensity in December?

In December, the average daily maximum UV index is 1. A UV Index of 2, and less, symbolizes a low health threat from unsafe 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
Grant Park, IL

Average temperature in December - Grant Park, IL
  • Average high temperature in December: 36.1°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 (30°F).

  • Average low temperature in December: 25.7°F

The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).

Average pressure in December
Grant Park, IL

Average pressure in December - Grant Park, IL
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in December
Grant Park, IL

Average wind speed in December - Grant Park, IL
  • Average wind speed in December: 9.5mph

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).

Average humidity in December
Grant Park, IL

Average humidity in December - Grant Park, IL
  • Average humidity in December: 81%

The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).

Average rainfall in December
Grant Park, IL

Average rainfall in December - Grant Park, IL
  • Average rainfall in December: 0.79"

The wettest month (with the highest rainfall) is May (2.2").
The driest month (with the least rainfall) is February (0.67").

Average rainfall days in December
Grant Park, IL

Average rainfall days in December - Grant Park, IL
  • Average rainfall days in December: 7 days

The month with the highest number of rainy days is July (15.7 days).
The month with the least rainy days is February (5.1 days).

Average snowfall in December
Grant Park, IL

Average snowfall in December - Grant Park, IL
  • Average snowfall in December: 0.87"

The month with the highest snowfall is January (1.42").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Grant Park, IL

Average snowfall days in December - Grant Park, IL
  • Average snowfall days in December: 7.5 days

The month with the highest number of snowfall days is January (10.3 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
Grant Park, IL

Average daylight in December / Average sunshine in December - Grant Park, IL
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in December: 4h and 1min

The months with the most sunshine are June, July and August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

Average sunshine days in December
Grant Park, IL

Average sunshine days in December - Grant Park, IL
  • Average sunshine days in December: 17.9 days

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is July (10.7 days).

Average UV index in December
Grant Park, IL

Average UV index in December - Grant Park, 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).

Average cloud cover in December
Grant Park, IL

Average cloud cover in December - Grant Park, IL
  • Average cloud cover in December: 57

The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 32).

Average visibility in December
Grant Park, IL

Average visibility in December - Grant Park, 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).

Grant Park, Illinois, USA

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