Monthly Historical AveragesLake Forest, IL
Average Temperature
High
2°
Feels -1
Low
-5°
Feels -10
Average Precipitation
10 Days
37.5mm
15.7cm
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Daily Historical Averages
S
M
T
W
T
F
S
ForecastWednesday, December 31, 2025
Day
-2°Feels -8
Wind
29 km/h W
Gust
44 km/h
Humidity
80%
P.O.P
60%
Snow
~1 cm
Night
-13°Feels -22
Wind
30 km/h NW
Gust
45 km/h
Humidity
86%
P.O.P
40%
Snow
<1 cm
Historical AveragesDec 31
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity