Clarks Hill, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.9 °C (low) to 23.9 °C (high). Annual precipitation averages 1162 Millimeters. Clarks Hill 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 | 1.1 °C | 13.4 °C | 101.6 mm |
| February | 2.3 °C | 15.3 °C | 98.55 mm |
| March | 5.6 °C | 19.7 °C | 114.81 mm |
| April | 9.9 °C | 24.2 °C | 74.42 mm |
| May | 14.9 °C | 28.3 °C | 82.8 mm |
| June | 19.3 °C | 31.8 °C | 115.57 mm |
| July | 21 °C | 33.4 °C | 109.47 mm |
| August | 20.5 °C | 32.7 °C | 111.76 mm |
| September | 17.4 °C | 29.9 °C | 93.98 mm |
| October | 11.2 °C | 24.8 °C | 72.14 mm |
| November | 5 °C | 19.1 °C | 81.28 mm |
| December | 2.4 °C | 14.6 °C | 105.66 mm |
| Annual | 10.9 °C | 23.9 °C | 1162.04 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 |