Tennille, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.6 °C (low) to 24.1 °C (high). Annual precipitation averages 1224 Millimeters. Tennille is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.9 °C | 14.1 °C | 113.28 mm |
| February | 3 °C | 16.2 °C | 110.74 mm |
| March | 6.6 °C | 20.3 °C | 112.78 mm |
| April | 10.5 °C | 24.3 °C | 87.63 mm |
| May | 15.6 °C | 28.2 °C | 79.76 mm |
| June | 19.8 °C | 31.3 °C | 114.3 mm |
| July | 21.6 °C | 33.3 °C | 108.71 mm |
| August | 20.9 °C | 32.1 °C | 131.06 mm |
| September | 18.1 °C | 29.6 °C | 102.62 mm |
| October | 12.2 °C | 24.7 °C | 72.14 mm |
| November | 6.1 °C | 19.6 °C | 75.44 mm |
| December | 3 °C | 15.2 °C | 115.57 mm |
| Annual | 11.6 °C | 24.1 °C | 1224.03 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| 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 |