Walhalla, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.6 °C (low) to 22.3 °C (high). Annual precipitation averages 1543.8 Millimeters. Walhalla is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.6 °C | 11.6 °C | 136.4 mm |
| February | 0.8 °C | 13.7 °C | 121.92 mm |
| March | 4.2 °C | 17.9 °C | 133.6 mm |
| April | 8.6 °C | 22.9 °C | 118.11 mm |
| May | 13.5 °C | 26.7 °C | 115.06 mm |
| June | 18.1 °C | 30.2 °C | 132.84 mm |
| July | 20 °C | 32 °C | 127 mm |
| August | 19.6 °C | 31.2 °C | 161.8 mm |
| September | 16.4 °C | 28.3 °C | 121.16 mm |
| October | 9.6 °C | 22.9 °C | 115.82 mm |
| November | 3.9 °C | 17.5 °C | 114.05 mm |
| December | 0.9 °C | 12.9 °C | 146.05 mm |
| Annual | 9.6 °C | 22.3 °C | 1543.81 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |