Lewisville, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.9 °F (low) to 76.6 °F (high). Annual precipitation averages 38.5 Inches. Lewisville 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.2 °F | 55.9 °F | 2.5 in. |
| February | 38.9 °F | 60.5 °F | 2.74 in. |
| March | 46.8 °F | 67.7 °F | 3.45 in. |
| April | 54.5 °F | 75.9 °F | 3.49 in. |
| May | 64.2 °F | 83.3 °F | 4.67 in. |
| June | 72.4 °F | 91.3 °F | 3.77 in. |
| July | 75.8 °F | 96.0 °F | 2.27 in. |
| August | 75.4 °F | 95.9 °F | 2.26 in. |
| September | 68.1 °F | 89.0 °F | 2.9 in. |
| October | 56.6 °F | 79.1 °F | 4.43 in. |
| November | 45.8 °F | 66.7 °F | 2.92 in. |
| December | 37.4 °F | 58.2 °F | 3.1 in. |
| Annual | 55.9 °F | 76.6 °F | 38.5 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 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 |