Holly Hill, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.1 °C (low) to 24.5 °C (high). Annual precipitation averages 1292.9 Millimeters. Holly Hill is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.2 °C | 14.7 °C | 94.74 mm |
| February | 3.5 °C | 16.6 °C | 96.01 mm |
| March | 6.8 °C | 20.6 °C | 96.27 mm |
| April | 11.1 °C | 24.9 °C | 92.2 mm |
| May | 15.9 °C | 28.6 °C | 97.79 mm |
| June | 20.2 °C | 31.7 °C | 148.84 mm |
| July | 22.1 °C | 33.2 °C | 145.8 mm |
| August | 21.7 °C | 32.2 °C | 130.05 mm |
| September | 18.8 °C | 29.6 °C | 126.75 mm |
| October | 12.6 °C | 25.2 °C | 100.84 mm |
| November | 6.5 °C | 20 °C | 66.04 mm |
| December | 3.6 °C | 16.1 °C | 97.54 mm |
| Annual | 12.1 °C | 24.5 °C | 1292.87 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |