Graniteville, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.9 °C (low) to 24.5 °C (high). Annual precipitation averages 1216.2 Millimeters. Graniteville 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 | 1.3 °C | 14.2 °C | 107.7 mm |
| February | 2.6 °C | 16.2 °C | 97.03 mm |
| March | 6.1 °C | 20.5 °C | 110.24 mm |
| April | 10.2 °C | 25 °C | 82.55 mm |
| May | 15.1 °C | 29 °C | 82.55 mm |
| June | 19.4 °C | 32.1 °C | 129.54 mm |
| July | 20.6 °C | 33.8 °C | 116.84 mm |
| August | 20.4 °C | 32.9 °C | 125.22 mm |
| September | 17.2 °C | 30.4 °C | 97.54 mm |
| October | 11.6 °C | 25.1 °C | 78.99 mm |
| November | 4.4 °C | 19.4 °C | 81.53 mm |
| December | 1.4 °C | 15.1 °C | 106.43 mm |
| Annual | 10.9 °C | 24.5 °C | 1216.16 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 |