Libertyville, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5 °C (low) to 14.4 °C (high). Annual precipitation averages 964.2 Millimeters. Libertyville 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 | -8.8 °C | -0.7 °C | 50.55 mm |
| February | -7.2 °C | 1.3 °C | 50.8 mm |
| March | -2.2 °C | 7.1 °C | 58.42 mm |
| April | 3.6 °C | 13.6 °C | 98.3 mm |
| May | 9.4 °C | 19.9 °C | 112.78 mm |
| June | 15.1 °C | 25.6 °C | 113.28 mm |
| July | 18.2 °C | 28.1 °C | 95.76 mm |
| August | 17.5 °C | 27.2 °C | 95.25 mm |
| September | 13.1 °C | 23.5 °C | 90.42 mm |
| October | 6.6 °C | 16.4 °C | 82.55 mm |
| November | 0.2 °C | 8.7 °C | 62.23 mm |
| December | -5.4 °C | 2.3 °C | 53.85 mm |
| Annual | 5 °C | 14.4 °C | 964.19 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 |