Gainesville, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.8 °C (low) to 21.3 °C (high). Annual precipitation averages 1420.6 Millimeters. Gainesville 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.4 °C | 10.5 °C | 134.37 mm |
| February | 1.1 °C | 12.6 °C | 130.3 mm |
| March | 4.4 °C | 16.9 °C | 135.38 mm |
| April | 8.8 °C | 21.6 °C | 108.46 mm |
| May | 13.7 °C | 25.3 °C | 106.68 mm |
| June | 18.2 °C | 29.1 °C | 113.03 mm |
| July | 20.1 °C | 30.7 °C | 105.92 mm |
| August | 19.7 °C | 30.2 °C | 131.83 mm |
| September | 16.4 °C | 27.3 °C | 108.2 mm |
| October | 10.1 °C | 22.2 °C | 103.89 mm |
| November | 4.3 °C | 16.7 °C | 111 mm |
| December | 1.2 °C | 11.9 °C | 131.57 mm |
| Annual | 9.8 °C | 21.3 °C | 1420.63 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| 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 |