Toomsboro, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.6 °C (low) to 25 °C (high). Annual precipitation averages 1203.7 Millimeters. Toomsboro 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.6 °C | 14.8 °C | 110.74 mm |
| February | 2.3 °C | 16.8 °C | 108.97 mm |
| March | 5.4 °C | 21 °C | 116.08 mm |
| April | 9.5 °C | 25.6 °C | 87.38 mm |
| May | 14.3 °C | 29.3 °C | 76.2 mm |
| June | 18.9 °C | 32.4 °C | 109.22 mm |
| July | 21.2 °C | 34.1 °C | 117.35 mm |
| August | 20.7 °C | 33.2 °C | 119.13 mm |
| September | 17.3 °C | 30.3 °C | 99.06 mm |
| October | 10.6 °C | 25.8 °C | 68.07 mm |
| November | 4.5 °C | 20.3 °C | 77.22 mm |
| December | 1.8 °C | 16.1 °C | 114.3 mm |
| Annual | 10.6 °C | 25 °C | 1203.72 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| 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 |