Lake Zurich, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4 °C (low) to 14.6 °C (high). Annual precipitation averages 974.6 Millimeters. Lake Zurich 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 | -9.7 °C | -1 °C | 49.02 mm |
| February | -8.2 °C | 1.1 °C | 49.53 mm |
| March | -3 °C | 7.6 °C | 58.67 mm |
| April | 2.7 °C | 14.4 °C | 97.28 mm |
| May | 8.7 °C | 20.7 °C | 119.63 mm |
| June | 14.3 °C | 26.3 °C | 116.84 mm |
| July | 17.2 °C | 28.7 °C | 97.79 mm |
| August | 16.3 °C | 27.4 °C | 101.09 mm |
| September | 11.9 °C | 23.6 °C | 87.38 mm |
| October | 5.4 °C | 16.5 °C | 82.3 mm |
| November | -0.8 °C | 8.6 °C | 61.47 mm |
| December | -6.4 °C | 1.8 °C | 53.59 mm |
| Annual | 4 °C | 14.6 °C | 974.59 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 |