Cornelia, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.3 °C (low) to 20.6 °C (high). Annual precipitation averages 1496.8 Millimeters. Cornelia 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 | -0.6 °C | 10.1 °C | 138.18 mm |
| February | 1.1 °C | 12.1 °C | 128.02 mm |
| March | 4.1 °C | 16.2 °C | 140.97 mm |
| April | 8.4 °C | 21 °C | 112.27 mm |
| May | 13.1 °C | 24.7 °C | 100.08 mm |
| June | 17.4 °C | 28.2 °C | 129.79 mm |
| July | 19.3 °C | 30 °C | 125.22 mm |
| August | 18.8 °C | 29.3 °C | 140.21 mm |
| September | 15.6 °C | 26.6 °C | 110.49 mm |
| October | 9.6 °C | 21.7 °C | 118.11 mm |
| November | 4.1 °C | 16.1 °C | 113.28 mm |
| December | 1.2 °C | 11.6 °C | 140.21 mm |
| Annual | 9.3 °C | 20.6 °C | 1496.83 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |