Brookville, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.6 °C (low) to 16.5 °C (high). Annual precipitation averages 1053.1 Millimeters. Brookville is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.8 °C | 2 °C | 78.23 mm |
| February | -5.6 °C | 4.2 °C | 59.69 mm |
| March | -0.9 °C | 9.8 °C | 85.6 mm |
| April | 4.8 °C | 16.9 °C | 109.73 mm |
| May | 11 °C | 22.4 °C | 115.57 mm |
| June | 15.9 °C | 27.2 °C | 114.81 mm |
| July | 17.6 °C | 28.8 °C | 101.85 mm |
| August | 16.6 °C | 28.4 °C | 76.45 mm |
| September | 12.4 °C | 25.1 °C | 77.98 mm |
| October | 6.1 °C | 18.3 °C | 75.44 mm |
| November | 0.5 °C | 10.7 °C | 77.72 mm |
| December | -3.9 °C | 4.4 °C | 80.01 mm |
| Annual | 5.6 °C | 16.5 °C | 1053.08 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°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 |