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.
View monthly temperatures as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daily high | 31 | 35 | 46 | 57 | 68 | 78 | 83 | 81 | 75 | 62 | 48 | 37 |
| Daily low | 17 | 19 | 29 | 37 | 48 | 58 | 64 | 63 | 55 | 43 | 32 | 23 |
Monthly precipitation
Total rain plus melted snow for each month, in inches.
View monthly precipitation as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lake Forest | 2.3 | 2.1 | 2.6 | 4.4 | 4.2 | 3.6 | 3.3 | 3.6 | 2.9 | 3.3 | 2.6 | 2.4 |
Monthly sunny days
Days each month with clear or partly cloudy skies.
View monthly sunny days as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lake Forest | 11 | 11 | 14 | 14 | 15 | 17 | 20 | 20 | 19 | 16 | 13 | 11 |
Compare Lake Forest with another city
Nearby cities and popular picks. Any two cities can be compared from the home page.
- Lake Forest vs Highwood, IL
- Lake Forest vs Lake Bluff, IL
- Lake Forest vs Lincolnshire, IL
- Lake Forest vs Highland Park, IL
- Lake Forest vs Deerfield, IL
- Lake Forest vs Vernon Hills, IL
- Lake Forest vs New York, NY
- Lake Forest vs Los Angeles, CA
- Lake Forest vs Chicago, IL
- Lake Forest vs Houston, TX
- Lake Forest vs Phoenix, AZ
- Lake Forest vs Philadelphia, PA
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).
Citing this page
Writing about Lake Forest's climate in a report or paper? Cite this page directly. The reference period is part of the citation, so it stays accurate even as individual numbers are refined; add an access date in whatever citation style you use.
VSWeather. Lake Forest, IL weather and climate: 1991-2020 climate normals. https://vsweather.com/weather/lake-forest-il/. Computed from Open-Meteo historical reanalysis, station-calibrated against NOAA NCEI climate normals.
BibTeX entry
@misc{vsweather_lake_forest_il,
author = {{VSWeather}},
title = {Lake Forest, IL weather and climate: 1991-2020 climate normals},
howpublished = {\url{https://vsweather.com/weather/lake-forest-il/}},
note = {Computed from Open-Meteo historical reanalysis, station-calibrated against NOAA NCEI climate normals}
}How to cite VSWeather explains the sources and verification behind these numbers.