Farmersville, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.7 °F (low) to 63.7 °F (high). Annual precipitation averages 39.6 Inches. Farmersville is located in USDA Plant Hardiness Zone 6a. 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 | 19.7 °F | 35.7 °F | 2.3 in. |
| February | 23.2 °F | 40.8 °F | 2.06 in. |
| March | 32.4 °F | 52.1 °F | 2.79 in. |
| April | 42.8 °F | 65.1 °F | 4.36 in. |
| May | 54.0 °F | 75.0 °F | 4.76 in. |
| June | 63.0 °F | 83.2 °F | 4.47 in. |
| July | 66.0 °F | 86.3 °F | 3.61 in. |
| August | 63.9 °F | 85.2 °F | 3.26 in. |
| September | 55.7 °F | 79.9 °F | 3.25 in. |
| October | 44.4 °F | 67.6 °F | 3.28 in. |
| November | 34.0 °F | 52.5 °F | 3.2 in. |
| December | 25.0 °F | 40.7 °F | 2.3 in. |
| Annual | 43.7 °F | 63.7 °F | 39.64 in. |
| 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |