Boonville, Indiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.2 °C (low) to 19.5 °C (high). Annual precipitation averages 1271.3 Millimeters. Boonville is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.9 °C | 5.4 °C | 89.92 mm |
| February | -2.5 °C | 7.9 °C | 85.6 mm |
| March | 2.1 °C | 13.4 °C | 117.6 mm |
| April | 7.7 °C | 20.3 °C | 133.1 mm |
| May | 13.6 °C | 25.2 °C | 134.11 mm |
| June | 18.2 °C | 29.7 °C | 118.11 mm |
| July | 20.1 °C | 31.2 °C | 115.06 mm |
| August | 18.9 °C | 30.8 °C | 82.04 mm |
| September | 14.7 °C | 27.7 °C | 95.5 mm |
| October | 8.3 °C | 21.3 °C | 90.68 mm |
| November | 2.4 °C | 13.6 °C | 102.62 mm |
| December | -1.7 °C | 7.7 °C | 106.93 mm |
| Annual | 8.2 °C | 19.5 °C | 1271.27 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |