December weather forecast
Algonquin, IL

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Weather in December

The first month of the winter, December, is still a cold month in Algonquin, Illinois, with an average temperature varying between 33.3°F (0.7°C) and 23.2°F (-4.9°C).

Temperature

The shift to December brings a decrease in the average high-temperature, falling from a frosty 45.1°F (7.3°C) in November to a wintry 33.3°F (0.7°C). Throughout the month of December, Algonquin witnesses an average low-temperature of 23.2°F (-4.9°C).

Humidity

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

Rainfall

The month with the least rainfall is December, when the rain falls for 6.5 days and typically collects 0.67" (17mm) of precipitation.

Snowfall

Months with snowfall in Algonquin are January through May, October through December. In December, in Algonquin, it is snowing for 9.1 days. Throughout December, 1.06" (27mm) of snow is accumulated. In Algonquin, during the entire year, snow falls for 43.2 days and aggregates up to 7.4" (188mm) of snow.

Daylight

With an average of 9h and 12min of daylight, December has the shortest days of the year in Algonquin, Illinois.
On the first day of December in Algonquin, sunrise is at 7:02 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:31 pm CST.

Sunshine

The average sunshine in December in Algonquin is 3.9h.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Algonquin. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for the average person.
Note: The UV index of 1 during December leads to these advisories:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
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Frequently asked questions

How cold is it in Algonquin in December?

The high-temperature, in December, in Algonquin, is 33.3°F (0.7°C), while the low-temperature averages to 23.2°F (-4.9°C).

What is the average humidity in December in Algonquin?

The average relative humidity in December in Algonquin, Illinois, is 82%.

What is the driest month in Algonquin?

The month with the least rainfall is December, when the rain falls for 6.5 days and typically collects 0.67" (17mm) of precipitation.

How much does it rain in Algonquin in December?

In Algonquin, Illinois, in December, it is raining for 6.5 days, with typically 0.67" (17mm) of accumulated precipitation.

How many days does it snow in December in Algonquin?

In Algonquin, during December, snow falls for 9.1 days and regularly aggregates up to 1.06" (27mm) of snow.

What is the month with the shortest days in Algonquin?

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

How many hours of daylight does Algonquin have in December?

In December, the average day length in Algonquin is 9h and 10min.

When is the sunrise / sunset in December in Algonquin?

In December, on the first day of the month, sunrise is at 7:02 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:31 pm CST.

How many hours of sunshine does Algonquin have in December?

In Algonquin, Illinois, the average sunshine duration in December is 3.9h.

What are the months with the lowest UV index in Algonquin?

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

What is the UV index intensity in December in Algonquin?

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 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
Algonquin, IL

Average temperature in December - Algonquin, IL
  • Average high temperature in December: 33.3°F

The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (27°F).

  • Average low temperature in December: 23.2°F

The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).

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Average pressure in December
Algonquin, IL

Average pressure in December - Algonquin, 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
Algonquin, IL

Average wind speed in December - Algonquin, IL
  • Average wind speed in December: 9.2mph

The windiest months (with the highest average wind speed) are January and February (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).

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Average humidity in December
Algonquin, IL

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

The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are April and October (76%).

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Average rainfall in December
Algonquin, IL

Average rainfall in December - Algonquin, IL
  • Average rainfall in December: 0.67"

The wettest months (with the highest rainfall) are April and August (1.89").
The driest month (with the least rainfall) is December (0.67").

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Average rainfall days in December
Algonquin, IL

Average rainfall days in December - Algonquin, IL
  • Average rainfall days in December: 6.5 days

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is February (4.1 days).

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Average snowfall in December
Algonquin, IL

Average snowfall in December - Algonquin, IL
  • Average snowfall in December: 1.06"

The month with the highest snowfall is January (2.01").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Algonquin, IL

Average snowfall days in December - Algonquin, IL
  • Average snowfall days in December: 9.1 days

The month with the highest number of snowfall days is January (12.2 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
Algonquin, IL

Average daylight in December / Average sunshine in December - Algonquin, 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: 3h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days in December
Algonquin, IL

Average sunshine days in December - Algonquin, IL
  • Average sunshine days in December: 18.5 days

The month with the most sunshine days is December (18.5 days).
The month with the least sunshine days is July (10.7 days).

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Average UV index in December
Algonquin, IL

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

The month with the highest UV index is 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
Algonquin, IL

Average cloud cover in December - Algonquin, IL
  • Average cloud cover in December: 59

The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July, August and September (Cloud cover 32).

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Average visibility in December
Algonquin, IL

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

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

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Algonquin, Illinois, USA

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