Harrells, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.5 °C (low) to 23 °C (high). Annual precipitation averages 1356.1 Millimeters. Harrells 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 | 0 °C | 12.7 °C | 93.98 mm |
| February | 1.2 °C | 14.6 °C | 83.06 mm |
| March | 4.6 °C | 18.6 °C | 99.31 mm |
| April | 9.6 °C | 23.4 °C | 89.66 mm |
| May | 14.6 °C | 27.1 °C | 102.36 mm |
| June | 19.2 °C | 30.6 °C | 136.14 mm |
| July | 21.3 °C | 32.4 °C | 154.94 mm |
| August | 20.4 °C | 31.4 °C | 161.29 mm |
| September | 17.6 °C | 28.8 °C | 168.15 mm |
| October | 10.9 °C | 23.9 °C | 92.96 mm |
| November | 4.9 °C | 18.6 °C | 86.36 mm |
| December | 1.8 °C | 14.3 °C | 87.88 mm |
| Annual | 10.5 °C | 23 °C | 1356.09 mm |
| 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 : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |