Winnsboro Mills, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.9 °F (low) to 73.6 °F (high). Annual precipitation averages 45.4 Inches. Winnsboro Mills 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 | 33.7 °F | 54.4 °F | 4.02 in. |
| February | 36.0 °F | 58.2 °F | 3.59 in. |
| March | 42.2 °F | 65.9 °F | 3.99 in. |
| April | 50.5 °F | 74.7 °F | 3.1 in. |
| May | 59.3 °F | 81.7 °F | 3.08 in. |
| June | 67.2 °F | 88.2 °F | 4.09 in. |
| July | 70.4 °F | 91.5 °F | 3.82 in. |
| August | 69.5 °F | 89.5 °F | 4.71 in. |
| September | 63.6 °F | 84.1 °F | 4.09 in. |
| October | 52.0 °F | 74.2 °F | 3.38 in. |
| November | 41.9 °F | 64.4 °F | 3.27 in. |
| December | 36.2 °F | 56.7 °F | 4.22 in. |
| Annual | 51.9 °F | 73.6 °F | 45.36 in. |
| 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 : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |