Harrellsville, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.1 °F (low) to 71.2 °F (high). Annual precipitation averages 51 Inches. Harrellsville 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. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 30.1 °F | 51.4 °F | 3.72 in. |
| February | 31.9 °F | 54.5 °F | 3.04 in. |
| March | 38.0 °F | 61.4 °F | 4.11 in. |
| April | 47.6 °F | 71.7 °F | 3.62 in. |
| May | 56.5 °F | 78.6 °F | 3.91 in. |
| June | 65.0 °F | 86.1 °F | 5.02 in. |
| July | 69.2 °F | 89.2 °F | 5.54 in. |
| August | 67.6 °F | 87.9 °F | 5.44 in. |
| September | 61.8 °F | 82.6 °F | 5.9 in. |
| October | 49.7 °F | 73.1 °F | 3.83 in. |
| November | 39.0 °F | 63.3 °F | 3.36 in. |
| December | 33.2 °F | 55.0 °F | 3.5 in. |
| Annual | 49.1 °F | 71.2 °F | 50.99 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 |