Keysville, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.3 °C (low) to 24.5 °C (high). Annual precipitation averages 1183.4 Millimeters. Keysville is located in USDA Plant Hardiness Zone 8b. 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 | 1.3 °C | 14.3 °C | 105.92 mm |
| February | 2.8 °C | 16.2 °C | 101.6 mm |
| March | 6.2 °C | 20.5 °C | 110.49 mm |
| April | 10.2 °C | 24.9 °C | 81.28 mm |
| May | 15.2 °C | 28.9 °C | 79.76 mm |
| June | 19.7 °C | 32 °C | 119.89 mm |
| July | 21.4 °C | 33.6 °C | 116.59 mm |
| August | 21.2 °C | 32.8 °C | 117.6 mm |
| September | 18.1 °C | 30.3 °C | 95.76 mm |
| October | 11.6 °C | 25.3 °C | 71.88 mm |
| November | 5.4 °C | 19.7 °C | 76.96 mm |
| December | 2.6 °C | 15.6 °C | 105.66 mm |
| Annual | 11.3 °C | 24.5 °C | 1183.39 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |