Fountain Inn, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.1 °F (low) to 72 °F (high). Annual precipitation averages 49.7 Inches. Fountain Inn is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 31.6 °F | 52.6 °F | 4.4 in. |
| February | 34.1 °F | 56.5 °F | 3.99 in. |
| March | 40.6 °F | 64.0 °F | 4.75 in. |
| April | 48.4 °F | 72.7 °F | 3.99 in. |
| May | 57.5 °F | 79.7 °F | 3.67 in. |
| June | 65.5 °F | 86.4 °F | 4.32 in. |
| July | 69.1 °F | 90.0 °F | 3.99 in. |
| August | 68.2 °F | 88.1 °F | 4.71 in. |
| September | 62.3 °F | 82.5 °F | 3.64 in. |
| October | 50.2 °F | 73.1 °F | 3.56 in. |
| November | 39.5 °F | 63.0 °F | 3.94 in. |
| December | 34.3 °F | 54.8 °F | 4.77 in. |
| Annual | 50.1 °F | 72 °F | 49.73 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |