Carrollton, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.5 °C (low) to 24.8 °C (high). Annual precipitation averages 1013.2 Millimeters. Carrollton is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.1 °C | 13.5 °C | 67.82 mm |
| February | 4.2 °C | 15.8 °C | 74.42 mm |
| March | 8.4 °C | 19.9 °C | 92.2 mm |
| April | 12.8 °C | 24.4 °C | 90.42 mm |
| May | 18.1 °C | 28.6 °C | 123.7 mm |
| June | 22.6 °C | 32.9 °C | 97.03 mm |
| July | 24.4 °C | 35.4 °C | 53.34 mm |
| August | 24.3 °C | 35.5 °C | 57.15 mm |
| September | 20.3 °C | 31.7 °C | 75.69 mm |
| October | 13.9 °C | 26.1 °C | 120.65 mm |
| November | 7.9 °C | 19.4 °C | 77.47 mm |
| December | 3.3 °C | 14.6 °C | 83.31 mm |
| Annual | 13.5 °C | 24.8 °C | 1013.2 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 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 |