Lewisville, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.8 °F (low) to 60.8 °F (high). Annual precipitation averages 44.3 Inches. Lewisville is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.2 °F | 34.2 °F | 3.17 in. |
| February | 20.8 °F | 38.2 °F | 2.36 in. |
| March | 29.1 °F | 48.8 °F | 3.45 in. |
| April | 39.6 °F | 61.5 °F | 4.51 in. |
| May | 50.5 °F | 71.6 °F | 4.89 in. |
| June | 59.7 °F | 80.0 °F | 5.22 in. |
| July | 62.1 °F | 82.8 °F | 4.43 in. |
| August | 60.1 °F | 81.7 °F | 3.37 in. |
| September | 52.6 °F | 76.7 °F | 3.14 in. |
| October | 41.6 °F | 64.8 °F | 3.2 in. |
| November | 31.9 °F | 50.6 °F | 3.43 in. |
| December | 23.8 °F | 38.8 °F | 3.08 in. |
| Annual | 40.8 °F | 60.8 °F | 44.25 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |