Summit, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.9 °C (low) to 23.2 °C (high). Annual precipitation averages 1215.9 Millimeters. Summit 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 | 1.2 °C | 12.8 °C | 103.12 mm |
| February | 2.4 °C | 14.9 °C | 92.71 mm |
| March | 5.7 °C | 19.1 °C | 107.95 mm |
| April | 10.1 °C | 23.5 °C | 82.55 mm |
| May | 14.9 °C | 27.6 °C | 86.11 mm |
| June | 19.3 °C | 31 °C | 128.78 mm |
| July | 21 °C | 32.6 °C | 116.59 mm |
| August | 20.4 °C | 31.7 °C | 121.92 mm |
| September | 17.4 °C | 28.8 °C | 101.09 mm |
| October | 11 °C | 23.7 °C | 83.31 mm |
| November | 5.3 °C | 18.3 °C | 88.14 mm |
| December | 2.3 °C | 14.1 °C | 103.63 mm |
| Annual | 10.9 °C | 23.2 °C | 1215.9 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |