Winnsboro, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.1 °C (low) to 24.2 °C (high). Annual precipitation averages 1180.3 Millimeters. Winnsboro 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 | 1.2 °C | 13.1 °C | 87.38 mm |
| February | 3.3 °C | 15.4 °C | 96.27 mm |
| March | 7.3 °C | 19.6 °C | 110.24 mm |
| April | 11.2 °C | 24.1 °C | 104.9 mm |
| May | 16.8 °C | 27.8 °C | 125.98 mm |
| June | 20.9 °C | 32 °C | 98.04 mm |
| July | 22.8 °C | 34.3 °C | 69.09 mm |
| August | 22.3 °C | 34.6 °C | 62.99 mm |
| September | 18.2 °C | 31 °C | 87.63 mm |
| October | 12.1 °C | 25.3 °C | 116.84 mm |
| November | 6.4 °C | 19 °C | 100.33 mm |
| December | 2.4 °C | 14.2 °C | 120.65 mm |
| Annual | 12.1 °C | 24.2 °C | 1180.34 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |