Lake Forest, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.3 °C (low) to 14.1 °C (high). Annual precipitation averages 1018.8 Millimeters. Lake Forest is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.4 °C | -0.7 °C | 54.1 mm |
| February | -6.8 °C | 1.3 °C | 52.32 mm |
| March | -1.9 °C | 6.8 °C | 58.93 mm |
| April | 3.4 °C | 12.9 °C | 106.68 mm |
| May | 9.2 °C | 19.3 °C | 119.63 mm |
| June | 14.7 °C | 24.9 °C | 108.97 mm |
| July | 18.4 °C | 27.6 °C | 102.36 mm |
| August | 18.2 °C | 26.8 °C | 100.33 mm |
| September | 13.8 °C | 23.1 °C | 106.17 mm |
| October | 7.1 °C | 16.4 °C | 86.36 mm |
| November | 0.7 °C | 8.7 °C | 69.85 mm |
| December | -5 °C | 2.3 °C | 53.09 mm |
| Annual | 5.3 °C | 14.1 °C | 1018.79 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |