Carrollton, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 56.4 °F (low) to 76.7 °F (high). Annual precipitation averages 39.9 Inches. 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 | 35.8 °F | 56.3 °F | 2.67 in. |
| February | 39.6 °F | 60.5 °F | 2.93 in. |
| March | 47.1 °F | 67.9 °F | 3.63 in. |
| April | 55.1 °F | 75.9 °F | 3.56 in. |
| May | 64.6 °F | 83.4 °F | 4.87 in. |
| June | 72.6 °F | 91.3 °F | 3.82 in. |
| July | 76.0 °F | 95.7 °F | 2.1 in. |
| August | 75.8 °F | 95.9 °F | 2.25 in. |
| September | 68.5 °F | 89.0 °F | 2.98 in. |
| October | 57.0 °F | 78.9 °F | 4.75 in. |
| November | 46.3 °F | 66.9 °F | 3.05 in. |
| December | 37.9 °F | 58.2 °F | 3.28 in. |
| Annual | 56.4 °F | 76.7 °F | 39.89 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |