December weather forecast
Risk, IL

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Weather in December

December, the first month of the winter in Risk, is also a wintry month, with an average temperature fluctuating between 36.5°F (2.5°C) and 26.1°F (-3.3°C).

Temperature

A decrease in the average high-temperature is observed during December, shifting from a frosty 47.8°F (8.8°C) in November to a wintry 36.5°F (2.5°C). In Risk, the average temperature during the nights of December drops to a subzero cold 26.1°F (-3.3°C).

Humidity

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

Rainfall

In Risk, during December, the rain falls for 6.9 days and regularly aggregates up to 0.87" (22mm) of precipitation. In Risk, during the entire year, the rain falls for 130.5 days and collects up to 17.44" (443mm) of precipitation.

Snowfall

Months with snowfall are January through April, October through December. In Risk, during December, snow falls for 6.1 days and regularly aggregates up to 1.1" (28mm) of snow. Throughout the year, there are 30.5 snowfall days, and 7.68" (195mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 18min of daylight.
On the first day of December, sunrise is at 6:58 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:36 pm CST.

Sunshine

In December, the average sunshine is 4.3h.

UV index

December is the month with the lowest UV index in Risk, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.
Note: The daily high UV index of 1 during December translates into the following recommendations:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Boost your sun resistance with garments that are densely woven yet spacious. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Updated: Aug 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

The average high-temperature and low-temperature during December are 36.5°F (2.5°C) and 26.1°F (-3.3°C) respectively. In July, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is computed to be 87.8°F (31°C).

What is the average humidity in December?

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

How much does it rain in December?

In Risk, Illinois, in December, during 6.9 rainfall days, 0.87" (22mm) of precipitation is typically accumulated.

How much does it snow in December?

In Risk, during December, snow falls for 6.1 days and regularly aggregates up to 1.1" (28mm) of snow.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 18min of daylight.

What is the average length of the day in December?

The average day length in December is 9h and 19min.

When is the sunrise / sunset in December in Risk?

On the first day of December in Risk, sunrise is at 6:58 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:36 pm CST.

How many hours of sunshine does Risk have in December?

In Risk, the average sunshine duration in December is 4.3h.

When is the lowest UV index?

The month with the lowest UV index is December, with an average maximum UV index of 1.

What is the UV index reading in December?

The average daily maximum UV index in December is 1. A UV Index estimate of 2, and below, represents a minimal hazard to health 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
Risk, IL

Average temperature in December - Risk, IL
  • Average high temperature in December: 36.5°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (30.6°F).

  • Average low temperature in December: 26.1°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).

Average pressure in December
Risk, IL

Average pressure in December - Risk, IL
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in December
Risk, IL

Average wind speed in December - Risk, IL
  • Average wind speed in December: 10.2mph

The windiest month (with the highest average wind speed) is January (10.8mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).

Average humidity in December
Risk, IL

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

The month with the highest relative humidity is July (86%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Risk, IL

Average rainfall in December - Risk, IL
  • Average rainfall in December: 0.87"

The wettest month (with the highest rainfall) is May (2.56").
The driest month (with the least rainfall) is January (0.79").

Average rainfall days in December
Risk, IL

Average rainfall days in December - Risk, IL
  • Average rainfall days in December: 6.9 days

The month with the highest number of rainy days is May (17 days).
The months with the least rainy days are January and February (5 days).

Average snowfall in December
Risk, IL

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

The month with the highest snowfall is January (2.09").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Risk, IL

Average snowfall days in December - Risk, IL
  • Average snowfall days in December: 6.1 days

The month with the highest number of snowfall days is January (10.6 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
Risk, IL

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

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in December: 4h and 2min

The month with the most sunshine is June (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

Average sunshine days in December
Risk, IL

Average sunshine days in December - Risk, IL
  • Average sunshine days in December: 18.9 days

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (11.4 days).

Average UV index in December
Risk, IL

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

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

Average cloud cover in December
Risk, IL

Average cloud cover in December - Risk, IL
  • Average cloud cover in December: 56

The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is September (Cloud cover 32).

Average visibility in December
Risk, IL

Average visibility in December - Risk, 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).

Risk, Illinois, USA

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