Cornelius, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.4 °C (low) to 21.5 °C (high). Annual precipitation averages 1163.1 Millimeters. Cornelius is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.2 °C | 10.4 °C | 92.2 mm |
| February | 0.1 °C | 12.7 °C | 79.25 mm |
| March | 3.8 °C | 16.9 °C | 104.9 mm |
| April | 8.6 °C | 21.9 °C | 99.06 mm |
| May | 13.8 °C | 25.8 °C | 93.47 mm |
| June | 18.3 °C | 29.8 °C | 108.97 mm |
| July | 20.4 °C | 31.5 °C | 106.17 mm |
| August | 19.6 °C | 30.7 °C | 112.27 mm |
| September | 16.2 °C | 27.7 °C | 105.16 mm |
| October | 9.3 °C | 22.4 °C | 84.33 mm |
| November | 3.2 °C | 16.6 °C | 83.57 mm |
| December | 0.2 °C | 12.1 °C | 93.73 mm |
| Annual | 9.4 °C | 21.5 °C | 1163.08 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 |