Windsor, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.1 °C (low) to 24.3 °C (high). Annual precipitation averages 1230.9 Millimeters. Windsor is located in USDA Plant Hardiness Zone 8b. 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 | 1.2 °C | 14.1 °C | 106.93 mm |
| February | 2.7 °C | 16.2 °C | 96.01 mm |
| March | 6.1 °C | 20.3 °C | 107.44 mm |
| April | 10.3 °C | 24.8 °C | 82.04 mm |
| May | 15.3 °C | 28.8 °C | 85.85 mm |
| June | 19.6 °C | 32.1 °C | 134.62 mm |
| July | 21.2 °C | 33.5 °C | 121.67 mm |
| August | 20.7 °C | 32.4 °C | 129.54 mm |
| September | 17.6 °C | 29.8 °C | 102.36 mm |
| October | 11.3 °C | 24.9 °C | 81.28 mm |
| November | 5.2 °C | 19.4 °C | 80.01 mm |
| December | 2.1 °C | 15.2 °C | 103.12 mm |
| Annual | 11.1 °C | 24.3 °C | 1230.87 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 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |