Harrisburg, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.6 °C (low) to 22 °C (high). Annual precipitation averages 1221.2 Millimeters. Harrisburg 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 | -0.9 °C | 11 °C | 93.73 mm |
| February | 0.4 °C | 13.1 °C | 83.06 mm |
| March | 4.1 °C | 17.2 °C | 106.17 mm |
| April | 9 °C | 22.5 °C | 101.85 mm |
| May | 14 °C | 26.4 °C | 96.27 mm |
| June | 18.6 °C | 30.3 °C | 119.13 mm |
| July | 20.6 °C | 32.1 °C | 121.41 mm |
| August | 19.8 °C | 31.1 °C | 123.44 mm |
| September | 16.5 °C | 28.1 °C | 107.95 mm |
| October | 9.6 °C | 22.8 °C | 89.41 mm |
| November | 3.6 °C | 17.1 °C | 85.6 mm |
| December | 0.4 °C | 12.5 °C | 93.22 mm |
| Annual | 9.6 °C | 22 °C | 1221.24 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 7b : -15°C to -12.2°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |