Winnsboro, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.4 °C (low) to 24.9 °C (high). Annual precipitation averages 1457.7 Millimeters. Winnsboro is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.3 °C | 13.8 °C | 140.46 mm |
| February | 3.9 °C | 16.2 °C | 130.56 mm |
| March | 7.9 °C | 20.5 °C | 132.08 mm |
| April | 12.1 °C | 24.9 °C | 152.91 mm |
| May | 17.1 °C | 29.3 °C | 119.63 mm |
| June | 21 °C | 32.6 °C | 113.54 mm |
| July | 22.5 °C | 34.2 °C | 102.87 mm |
| August | 21.8 °C | 34.4 °C | 90.68 mm |
| September | 18.4 °C | 31.7 °C | 89.66 mm |
| October | 11.9 °C | 26.6 °C | 113.28 mm |
| November | 6.6 °C | 19.9 °C | 129.03 mm |
| December | 3.4 °C | 15.2 °C | 143 mm |
| Annual | 12.4 °C | 24.9 °C | 1457.7 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |