Toledo, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.7 °C (low) to 18 °C (high). Annual precipitation averages 1105.7 Millimeters. Toledo is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.2 °C | 2.8 °C | 73.41 mm |
| February | -4.6 °C | 5.4 °C | 62.23 mm |
| March | 0.5 °C | 11.6 °C | 81.28 mm |
| April | 6.3 °C | 18.7 °C | 121.16 mm |
| May | 12.4 °C | 24.1 °C | 119.63 mm |
| June | 17.3 °C | 28.8 °C | 125.98 mm |
| July | 18.8 °C | 30.6 °C | 108.71 mm |
| August | 17.7 °C | 29.9 °C | 77.47 mm |
| September | 13.2 °C | 26.9 °C | 80.52 mm |
| October | 7.1 °C | 20.2 °C | 90.42 mm |
| November | 1.3 °C | 11.9 °C | 93.98 mm |
| December | -3.3 °C | 5.3 °C | 70.87 mm |
| Annual | 6.7 °C | 18 °C | 1105.66 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |