Carrollton, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.1 °C (low) to 22 °C (high). Annual precipitation averages 1376.4 Millimeters. Carrollton 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 | -0.1 °C | 11.4 °C | 129.29 mm |
| February | 1.6 °C | 13.7 °C | 131.06 mm |
| March | 4.9 °C | 18.2 °C | 139.7 mm |
| April | 9.1 °C | 22.6 °C | 114.55 mm |
| May | 14.2 °C | 26.3 °C | 97.79 mm |
| June | 18.5 °C | 29.7 °C | 109.47 mm |
| July | 20.4 °C | 31.2 °C | 112.52 mm |
| August | 20.1 °C | 30.8 °C | 100.84 mm |
| September | 16.6 °C | 27.9 °C | 104.9 mm |
| October | 10.2 °C | 22.8 °C | 90.42 mm |
| November | 4.2 °C | 17.2 °C | 113.79 mm |
| December | 1.4 °C | 12.7 °C | 132.08 mm |
| Annual | 10.1 °C | 22 °C | 1376.41 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 |