Mills River, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 43.9 °F (low) to 66.8 °F (high). Annual precipitation averages 51.5 Inches. Mills River is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.9 °F | 47.3 °F | 4.7 in. |
| February | 28.2 °F | 51.2 °F | 3.37 in. |
| March | 34.2 °F | 58.3 °F | 4.26 in. |
| April | 42.1 °F | 67.8 °F | 4.36 in. |
| May | 51.0 °F | 74.8 °F | 4.09 in. |
| June | 59.3 °F | 80.9 °F | 4.5 in. |
| July | 63.0 °F | 83.8 °F | 5.04 in. |
| August | 61.8 °F | 82.5 °F | 5.17 in. |
| September | 55.7 °F | 77.7 °F | 3.96 in. |
| October | 43.7 °F | 68.6 °F | 3.6 in. |
| November | 33.4 °F | 58.5 °F | 3.91 in. |
| December | 28.8 °F | 50.4 °F | 4.55 in. |
| Annual | 43.9 °F | 66.8 °F | 51.51 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |