January weather forecastLake Forest, IL
January
Weather in January
January, the same as December, in Lake Forest, Illinois, is another subzero cold winter month, with temperature in the range of an average low of 18.9°F (-7.3°C) and an average high of 28.6°F (-1.9°C).Temperature
With average high temperatures of 28.6°F (-1.9°C) and lows of 18.9°F (-7.3°C), January is the coldest month.Humidity
January and February, with an average relative humidity of 82%, are the most humid months.Rainfall
In Lake Forest, in January, it is raining for 6.2 days, with typically 1.54" (39mm) of accumulated precipitation. Throughout the year, there are 154.1 rainfall days, and 30.24" (768mm) of precipitation is accumulated.Snowfall
Months with snowfall in Lake Forest are January through April, October through December. January is the month with the most snowfall in Lake Forest, Illinois. Snow falls for 11.9 days and accumulates 4.13" (105mm) of snow.Daylight
In January, the average length of the day is 9h and 31min.On the first day of the month, sunrise is at 7:20 am and sunset at 4:29 pm. On the last day of January, sunrise is at 7:05 am and sunset at 5:03 pm CST.
Sunshine
January has the least sunshine of the year in Lake Forest, with an average of 3.8h of sunshine.UV index
In January, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index, 2 during January, leads to the following recommendations:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Enhance your sun protection with tightly woven, yet airy clothing. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Lake Forest, IL
- Average high temperature in January: 28.6°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 January: 18.9°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 January
Lake Forest, IL
- Average pressure in January: 30.1"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 January
Lake Forest, IL
- Average wind speed in January: 11.9mph
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 January
Lake Forest, IL
- Average humidity in January: 82%
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 January
Lake Forest, IL
- Average rainfall in January: 1.54"
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 January
Lake Forest, IL
- Average rainfall days in January: 6.2 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 January
Lake Forest, IL
- Average snowfall in January: 4.13"
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 January
Lake Forest, IL
- Average snowfall days in January: 11.9 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 January /
Average sunshine in January
Lake Forest, IL
- Average daylight in January: 9h and 30min
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 January: 3h and 48min
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 January
Lake Forest, IL
- Average sunshine days in January: 12.8 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 January
Lake Forest, IL
- Average UV index in January: 2
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 January
Lake Forest, IL
- Average cloud cover in January: 61
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 January
Lake Forest, IL
- Average visibility in January: 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).
