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Lake Forest, IL weather and climate

Lake County, IL · population 19,190 · about 696 ft elevation

Everything below is a 30 year average for 1991-2020, computed from daily climate history at Lake Forest's own coordinates.

The year at a glance

Sunny days
181
clear or partly cloudy, per year
Precipitation
37 in
per year
Wet days
130
rain or snow per year
Snowfall
38 in
per year
Hot days
15
above 90 °F
Freezing nights
127
at or below 32 °F
Humidity
72%
average relative
Average temperature
50 °F
year round

Monthly temperatures

Average daily high and low for each month, in °F.

Daily highDaily low
20406080JanMarMayJulSepNovDaily high, Jan: 31 °FDaily high, Feb: 35 °FDaily high, Mar: 46 °FDaily high, Apr: 57 °FDaily high, May: 68 °FDaily high, Jun: 78 °FDaily high, Jul: 83 °FDaily high, Aug: 81 °FDaily high, Sep: 75 °FDaily high, Oct: 62 °FDaily high, Nov: 48 °FDaily high, Dec: 37 °FDaily low, Jan: 17 °FDaily low, Feb: 19 °FDaily low, Mar: 29 °FDaily low, Apr: 37 °FDaily low, May: 48 °FDaily low, Jun: 58 °FDaily low, Jul: 64 °FDaily low, Aug: 63 °FDaily low, Sep: 55 °FDaily low, Oct: 43 °FDaily low, Nov: 32 °FDaily low, Dec: 23 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high313546576878838175624837
Daily low171929374858646355433223

Monthly precipitation

Total rain plus melted snow for each month, in inches.

0.02.04.0JanMarMayJulSepNovLake Forest, Jan: 2.3 inLake Forest, Feb: 2.1 inLake Forest, Mar: 2.6 inLake Forest, Apr: 4.4 inLake Forest, May: 4.2 inLake Forest, Jun: 3.6 inLake Forest, Jul: 3.3 inLake Forest, Aug: 3.6 inLake Forest, Sep: 2.9 inLake Forest, Oct: 3.3 inLake Forest, Nov: 2.6 inLake Forest, Dec: 2.4 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Lake Forest2.32.12.64.44.23.63.33.62.93.32.62.4

Monthly sunny days

Days each month with clear or partly cloudy skies.

01020JanMarMayJulSepNovLake Forest, Jan: 11 daysLake Forest, Feb: 11 daysLake Forest, Mar: 14 daysLake Forest, Apr: 14 daysLake Forest, May: 15 daysLake Forest, Jun: 17 daysLake Forest, Jul: 20 daysLake Forest, Aug: 20 daysLake Forest, Sep: 19 daysLake Forest, Oct: 16 daysLake Forest, Nov: 13 daysLake Forest, Dec: 11 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Lake Forest111114141517202019161311

Compare Lake Forest with another city

Nearby cities and popular picks. Any two cities can be compared from the home page.

See weather for every covered Illinois city

About this data

Figures are 30 year averages for 1991-2020. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.

Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).