Williamston, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.4 °C (low) to 21.8 °C (high). Annual precipitation averages 1334.3 Millimeters. Williamston is located in USDA Plant Hardiness Zone 8a. 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 | 0 °C | 11.2 °C | 93.98 mm |
| February | 1 °C | 12.9 °C | 81.03 mm |
| March | 4.4 °C | 16.8 °C | 103.38 mm |
| April | 9.7 °C | 21.9 °C | 95.25 mm |
| May | 14.7 °C | 25.8 °C | 95 mm |
| June | 19.1 °C | 29.8 °C | 129.29 mm |
| July | 21.3 °C | 31.6 °C | 142.49 mm |
| August | 20.4 °C | 30.6 °C | 146.05 mm |
| September | 17.4 °C | 27.8 °C | 170.43 mm |
| October | 10.7 °C | 22.8 °C | 102.11 mm |
| November | 4.9 °C | 17.4 °C | 85.85 mm |
| December | 1.7 °C | 13 °C | 89.41 mm |
| Annual | 10.4 °C | 21.8 °C | 1334.27 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 50-75 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |