Winnsboro, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.9 °C (low) to 23.2 °C (high). Annual precipitation averages 1150.6 Millimeters. Winnsboro is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.7 °C | 12.4 °C | 102.11 mm |
| February | 2 °C | 14.5 °C | 90.93 mm |
| March | 5.4 °C | 18.8 °C | 101.09 mm |
| April | 10.1 °C | 23.8 °C | 78.99 mm |
| May | 15.1 °C | 27.6 °C | 77.98 mm |
| June | 19.4 °C | 31.3 °C | 103.63 mm |
| July | 21.3 °C | 33.1 °C | 97.28 mm |
| August | 20.8 °C | 32 °C | 119.13 mm |
| September | 17.5 °C | 29.1 °C | 103.89 mm |
| October | 10.9 °C | 23.6 °C | 85.34 mm |
| November | 5.3 °C | 18 °C | 83.06 mm |
| December | 2.2 °C | 13.7 °C | 107.19 mm |
| Annual | 10.9 °C | 23.2 °C | 1150.62 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°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 |