December weather forecast
Lake Forest, IL

Weather in December

The first month of the winter, December, is also a wintry month in Lake Forest, Illinois, with temperature in the range of an average high of 34.5°F (1.4°C) and an average low of 26.2°F (-3.2°C).

Temperature

In December, the average high-temperature decreases, from a chilly 45.5°F (7.5°C) in November, to a wintry 34.5°F (1.4°C). The average low-temperature, in December, is 26.2°F (-3.2°C).

Humidity

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

Rainfall

December is the month with the least rainfall in Lake Forest. Rain falls for 8.6 days and accumulates 1.3" (33mm) of precipitation.

Snowfall

Months with snowfall in Lake Forest are January through April, October through December. In Lake Forest, in December, snow falls for 9.1 days, with typically accumulated 2.05" (52mm) of snow. Throughout the year, in Lake Forest, there are 42.9 snowfall days, and 13.82" (351mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9.1h of daylight.

Sunshine

In Lake Forest, Illinois, the average sunshine in December is 4.1h.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from the exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 1 transform into the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in December in Lake Forest?

The average relative humidity in December in Lake Forest is 80%.

What is the driest month in Lake Forest?

December is the month with the least rainfall. Rain falls for 8.6 days and accumulates 1.3" (33mm) of precipitation.

How much does it rain in Lake Forest in December?

In Lake Forest, Illinois, during December, the rain falls for 8.6 days and regularly aggregates up to 1.3" (33mm) of precipitation.

How much does it snow in Lake Forest in December?

In Lake Forest, in December, snow falls for 9.1 days, with typically accumulated 2.05" (52mm) of snow.

What is the month with the shortest days in Lake Forest?

The month with the shortest days is December, with an average of 9.1h of daylight.

How many hours of daylight does Lake Forest have in December?

In Lake Forest, the average length of the day in December is 9.1h.

How long on average sun shines in December in Lake Forest?

In December, the average sunshine in Lake Forest is 4.1h.

When is the lowest UV index in Lake Forest?

December is the month with the lowest UV index in Lake Forest, with an average maximum UV index of 1.

What is the UV index reading in December in Lake Forest?

The average daily maximum UV index in December in Lake Forest is 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to the UV radiation.

Average temperature in December
Lake Forest, IL

Average temperature in December - Lake Forest, IL
  • Average high temperature in December: 34.5°F

The warmest month (with the highest average high temperature) is July (77.7°F).
The month with the lowest average high temperature is January (28.6°F).

  • Average low temperature in December: 26.2°F

Months with the highest average low temperature are July and August (66.7°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).

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Average pressure in December
Lake Forest, IL

Average pressure in December - Lake Forest, IL
  • Average pressure in December: 30.09"

The month with the highest atmospheric pressure is January (30.1").
The month with the lowest atmospheric pressure is June (29.92").

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Average wind speed in December
Lake Forest, IL

Average wind speed in December - Lake Forest, IL
  • Average wind speed in December: 11.2mph

The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest month (with the lowest average wind speed) is August (7.4mph).

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Average humidity in December
Lake Forest, IL

Average humidity in December - Lake Forest, IL
  • Average humidity in December: 80%

Months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (73%).

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Average rainfall in December
Lake Forest, IL

Average rainfall in December - Lake Forest, IL
  • Average rainfall in December: 1.3"

The wettest months (with the highest rainfall) are May and June (3.82").
The driest month (with the least rainfall) is December (1.3").

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Average rainfall days in December
Lake Forest, IL

Average rainfall days in December - Lake Forest, IL
  • Average rainfall days in December: 8.6 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is February (5.9 days).

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Average snowfall in December
Lake Forest, IL

Average snowfall in December - Lake Forest, IL
  • Average snowfall in December: 2.05"

The month with the highest snowfall is January (4.13").
Months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Lake Forest, IL

Average snowfall days in December - Lake Forest, IL
  • Average snowfall days in December: 9.1 days

The month with the highest number of snowfall days is January (11.9 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Lake Forest, IL

Average daylight in December / Average sunshine in December - Lake Forest, IL
  • Average daylight in December: 9.1h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.1h).

  • Average sunshine in December: 4.1h

The month with the most sunshine is August (Average sunshine: 10.7h).
The month with the least sunshine is January (Average sunshine: 3.8h).

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Average sunshine days in December
Lake Forest, IL

Average sunshine days in December - Lake Forest, IL
  • Average sunshine days in December: 15.3 days

The month with the most sunshine days is December (15.3 days).
The month with the least sunshine days is April (10.8 days).

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Average UV index in December
Lake Forest, IL

Average UV index in December - Lake Forest, IL
  • Average UV index in December: 1

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

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Average cloud cover in December
Lake Forest, IL

Average cloud cover in December - Lake Forest, IL
  • Average cloud cover in December: 58

The month with the most cloud cover is January (Cloud cover 61).
Months with the least cloud cover are July and August (Cloud cover 27).

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Average visibility in December
Lake Forest, IL

Average visibility in December - Lake Forest, IL
  • Average visibility in December: 6mi

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

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