Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
Lake Forest in December experiences a subtle temperature decline, with average high-temperatures reducing from a chilly 45.5°F (7.5°C) in November to a cold 34.5°F (1.4°C). The temperature during December sees a subtle transition from day to night, averaging a low of 26.2°F (-3.2°C).Humidity
The average relative humidity in December in Lake Forest is 80%.Rainfall
The month with the least rainfall in Lake Forest is December, when the rain falls for 8.6 days and typically collects 1.3" (33mm) of precipitation.Snowfall
January through April, October through December are months with snowfall in Lake Forest. In Lake Forest, in December, during 9.1 snowfall days, 2.05" (52mm) of snow is typically accumulated. In Lake Forest, during the entire year, snow falls for 42.9 days and aggregates up to 13.82" (351mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 12min of daylight.On the first day of the month, sunrise is at 7:01 am and sunset at 4:20 pm. On the last day of December, sunrise is at 7:20 am and sunset at 4:29 pm CST.
Sunshine
In December, the average sunshine in Lake Forest is 4.1h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index in Lake Forest. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the average person.Note: The average daily UV index of 1 in December transforms into the following instructions:
Long-term sun exposure is typically not a concern for most. However, those with sensitive skin, infants, and children must always have protection. When the Sun is at its strongest around midday, find shade and limit exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold is December in Lake Forest?
What is the average humidity in December in Lake Forest?
What is the driest month in Lake Forest?
How much does it rain in Lake Forest in December?
How much does it snow in Lake Forest in December?
What is the month with the shortest days in Lake Forest?
How many hours of daylight does Lake Forest have in December?
When are sunrise and sunset in December in Lake Forest?
How long on average sun shines in December in Lake Forest?
What is the month with the lowest UV index in Lake Forest?
How high is the UV index in December in Lake Forest?
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
The 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).
Average pressure in December
Lake Forest, IL
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
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).
Average humidity in December
Lake Forest, IL
- Average humidity in December: 80%
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (73%).
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").
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).
Average snowfall in December
Lake Forest, IL
- Average snowfall in December: 2.05"
The month with the highest snowfall is January (4.13").
The months with the least snowfall are May, June, July, August and September (0").
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).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Lake Forest, 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: 4h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
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).
Average UV index in December
Lake Forest, IL
- Average UV index in December: 1
The 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).
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).
The months with the least cloud cover are July and August (Cloud cover 27).
Average visibility in December
Lake Forest, 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).
Lake Forest, Illinois, USA
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