Gantt, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.2 °C (low) to 21.9 °C (high). Annual precipitation averages 1312.7 Millimeters. Gantt is located in USDA Plant Hardiness Zone 8a. 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 | -0.2 °C | 11.2 °C | 112.01 mm |
| February | 1.2 °C | 13.4 °C | 103.38 mm |
| March | 4.9 °C | 17.5 °C | 119.63 mm |
| April | 9.2 °C | 22.3 °C | 111.51 mm |
| May | 14.3 °C | 26.3 °C | 90.42 mm |
| June | 18.7 °C | 29.9 °C | 105.16 mm |
| July | 20.6 °C | 31.9 °C | 114.05 mm |
| August | 20.2 °C | 30.9 °C | 133.35 mm |
| September | 17 °C | 27.8 °C | 97.28 mm |
| October | 10.3 °C | 22.4 °C | 99.31 mm |
| November | 4.3 °C | 16.9 °C | 101.85 mm |
| December | 1.4 °C | 12.4 °C | 124.71 mm |
| Annual | 10.2 °C | 21.9 °C | 1312.66 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 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |