Forest Lake, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.2 °C (low) to 14.7 °C (high). Annual precipitation averages 968 Millimeters. Forest Lake is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.6 °C | -0.9 °C | 48.77 mm |
| February | -8.1 °C | 1.2 °C | 49.78 mm |
| March | -2.9 °C | 7.5 °C | 58.93 mm |
| April | 2.8 °C | 14.4 °C | 97.54 mm |
| May | 8.8 °C | 20.7 °C | 116.84 mm |
| June | 14.4 °C | 26.3 °C | 115.32 mm |
| July | 17.3 °C | 28.7 °C | 97.54 mm |
| August | 16.5 °C | 27.5 °C | 99.57 mm |
| September | 12.1 °C | 23.7 °C | 86.87 mm |
| October | 5.6 °C | 16.6 °C | 82.3 mm |
| November | -0.7 °C | 8.6 °C | 61.21 mm |
| December | -6.3 °C | 1.9 °C | 53.34 mm |
| Annual | 4.2 °C | 14.7 °C | 968.01 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°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 |