Toulon, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40 °F (low) to 60.1 °F (high). Annual precipitation averages 37.6 Inches. Toulon is located in USDA Plant Hardiness Zone 5b. 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 | 14.4 °F | 30.7 °F | 1.85 in. |
| February | 17.8 °F | 35.3 °F | 1.94 in. |
| March | 28.0 °F | 48.1 °F | 2.37 in. |
| April | 38.7 °F | 61.4 °F | 3.64 in. |
| May | 50.6 °F | 72.3 °F | 5.06 in. |
| June | 60.4 °F | 81.1 °F | 4.36 in. |
| July | 63.7 °F | 84.1 °F | 3.66 in. |
| August | 61.5 °F | 82.5 °F | 3.75 in. |
| September | 53.1 °F | 76.7 °F | 3.57 in. |
| October | 41.6 °F | 64.1 °F | 2.91 in. |
| November | 30.2 °F | 49.0 °F | 2.53 in. |
| December | 20.3 °F | 36.2 °F | 1.95 in. |
| Annual | 40 °F | 60.1 °F | 37.59 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |