South Mills, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.2 °F (low) to 71.6 °F (high). Annual precipitation averages 51.4 Inches. South Mills is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 31.2 °F | 52.1 °F | 3.85 in. |
| February | 32.5 °F | 54.7 °F | 3.17 in. |
| March | 38.8 °F | 61.3 °F | 4.06 in. |
| April | 48.4 °F | 71.4 °F | 3.7 in. |
| May | 57.5 °F | 78.9 °F | 4.09 in. |
| June | 65.9 °F | 86.2 °F | 4.87 in. |
| July | 70.1 °F | 89.9 °F | 5.52 in. |
| August | 68.6 °F | 88.3 °F | 5.55 in. |
| September | 63.4 °F | 83.3 °F | 5.27 in. |
| October | 51.4 °F | 74.0 °F | 4.01 in. |
| November | 40.4 °F | 63.9 °F | 3.61 in. |
| December | 34.5 °F | 55.7 °F | 3.71 in. |
| Annual | 50.2 °F | 71.6 °F | 51.41 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |