Gaston, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.6 °C (low) to 23.8 °C (high). Annual precipitation averages 1222 Millimeters. Gaston 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 | 1.6 °C | 13.4 °C | 102.11 mm |
| February | 2.8 °C | 15.4 °C | 93.98 mm |
| March | 6.4 °C | 19.5 °C | 106.43 mm |
| April | 10.8 °C | 24.3 °C | 80.77 mm |
| May | 15.6 °C | 28.3 °C | 86.36 mm |
| June | 20 °C | 31.6 °C | 128.02 mm |
| July | 21.6 °C | 33.1 °C | 120.14 mm |
| August | 21.2 °C | 32.2 °C | 125.73 mm |
| September | 18.2 °C | 29.4 °C | 106.68 mm |
| October | 11.9 °C | 24.3 °C | 88.65 mm |
| November | 6 °C | 18.8 °C | 81.79 mm |
| December | 2.8 °C | 14.7 °C | 101.35 mm |
| Annual | 11.6 °C | 23.8 °C | 1222.01 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |