Farmersville, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.6 °C (low) to 24.2 °C (high). Annual precipitation averages 1073.7 Millimeters. Farmersville is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.4 °C | 12.8 °C | 65.53 mm |
| February | 3.4 °C | 15.3 °C | 82.04 mm |
| March | 7.7 °C | 19.5 °C | 97.79 mm |
| April | 11.9 °C | 23.8 °C | 95 mm |
| May | 17.1 °C | 27.8 °C | 130.56 mm |
| June | 21.5 °C | 32.2 °C | 101.85 mm |
| July | 23.4 °C | 34.7 °C | 51.31 mm |
| August | 23.1 °C | 34.9 °C | 61.98 mm |
| September | 19.1 °C | 31.1 °C | 79.5 mm |
| October | 12.9 °C | 25.4 °C | 124.21 mm |
| November | 7.2 °C | 18.8 °C | 89.41 mm |
| December | 2.7 °C | 13.9 °C | 94.49 mm |
| Annual | 12.6 °C | 24.2 °C | 1073.67 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |