Brookville, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.2 °C (low) to 18.1 °C (high). Annual precipitation averages 1112 Millimeters. Brookville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.9 °C | 3.6 °C | 83.31 mm |
| February | -4.8 °C | 5.9 °C | 68.58 mm |
| March | -0.3 °C | 11.7 °C | 92.71 mm |
| April | 5.5 °C | 18.7 °C | 116.59 mm |
| May | 11.4 °C | 23.9 °C | 120.65 mm |
| June | 16.2 °C | 28.6 °C | 117.09 mm |
| July | 18.1 °C | 30.3 °C | 104.65 mm |
| August | 17.2 °C | 29.8 °C | 76.96 mm |
| September | 12.7 °C | 26.7 °C | 74.68 mm |
| October | 6.1 °C | 19.9 °C | 83.57 mm |
| November | 0.8 °C | 12.4 °C | 86.11 mm |
| December | -3.1 °C | 5.9 °C | 87.12 mm |
| Annual | 6.2 °C | 18.1 °C | 1112.02 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |