Toluca, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.8 °C (low) to 16.4 °C (high). Annual precipitation averages 947.2 Millimeters. Toluca 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 | -9.2 °C | 0.1 °C | 49.78 mm |
| February | -7.3 °C | 2.7 °C | 46.23 mm |
| March | -1.9 °C | 9.5 °C | 65.02 mm |
| April | 3.9 °C | 16.9 °C | 92.46 mm |
| May | 10.5 °C | 23.1 °C | 116.08 mm |
| June | 15.9 °C | 28 °C | 104.9 mm |
| July | 17.8 °C | 29.6 °C | 98.3 mm |
| August | 16.6 °C | 28.7 °C | 94.23 mm |
| September | 11.9 °C | 25.7 °C | 87.63 mm |
| October | 5.5 °C | 18.7 °C | 74.68 mm |
| November | -0.5 °C | 10.1 °C | 67.31 mm |
| December | -5.9 °C | 3.1 °C | 50.55 mm |
| Annual | 4.8 °C | 16.4 °C | 947.17 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 |