Summerville, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54.1 °F (low) to 76 °F (high). Annual precipitation averages 53.7 Inches. Summerville is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 36.2 °F | 59.2 °F | 3.69 in. |
| February | 38.6 °F | 62.7 °F | 3.47 in. |
| March | 44.3 °F | 69.1 °F | 3.76 in. |
| April | 52.2 °F | 76.4 °F | 3.44 in. |
| May | 60.9 °F | 82.9 °F | 3.64 in. |
| June | 68.8 °F | 88.4 °F | 6.18 in. |
| July | 72.0 °F | 91.2 °F | 6.7 in. |
| August | 71.3 °F | 89.6 °F | 6.35 in. |
| September | 66.5 °F | 85.1 °F | 5.73 in. |
| October | 55.3 °F | 77.2 °F | 4.18 in. |
| November | 44.5 °F | 68.3 °F | 2.88 in. |
| December | 39.0 °F | 61.4 °F | 3.68 in. |
| Annual | 54.1 °F | 76 °F | 53.7 in. |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |