Williams, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12 °C (low) to 24.7 °C (high). Annual precipitation averages 1265.9 Millimeters. Williams 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. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.2 °C | 15.2 °C | 95.25 mm |
| February | 3.5 °C | 17.1 °C | 95.5 mm |
| March | 6.8 °C | 20.9 °C | 94.49 mm |
| April | 10.9 °C | 25 °C | 84.58 mm |
| May | 15.7 °C | 28.7 °C | 88.14 mm |
| June | 20 °C | 31.8 °C | 144.78 mm |
| July | 21.8 °C | 33.2 °C | 144.78 mm |
| August | 21.5 °C | 32.3 °C | 150.62 mm |
| September | 18.7 °C | 29.7 °C | 122.43 mm |
| October | 12.4 °C | 25.3 °C | 84.84 mm |
| November | 6.4 °C | 20.3 °C | 67.82 mm |
| December | 3.6 °C | 16.4 °C | 92.71 mm |
| Annual | 12 °C | 24.7 °C | 1265.94 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 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 | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |