Carrollton, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.6 °C (low) to 20.7 °C (high). Annual precipitation averages 1267.2 Millimeters. Carrollton 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. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.7 °C | 9.7 °C | 90.68 mm |
| February | 1.6 °C | 11.1 °C | 72.9 mm |
| March | 5.1 °C | 14.8 °C | 102.62 mm |
| April | 10.4 °C | 20.6 °C | 93.98 mm |
| May | 15.4 °C | 24.8 °C | 103.38 mm |
| June | 20.1 °C | 29.1 °C | 115.82 mm |
| July | 22.6 °C | 31.3 °C | 125.22 mm |
| August | 21.9 °C | 30.2 °C | 144.02 mm |
| September | 18.9 °C | 27.2 °C | 137.67 mm |
| October | 12.6 °C | 21.8 °C | 99.57 mm |
| November | 6.7 °C | 16.2 °C | 86.87 mm |
| December | 2.9 °C | 11.8 °C | 94.49 mm |
| Annual | 11.6 °C | 20.7 °C | 1267.22 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |