Brookville, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3 °C (low) to 15 °C (high). Annual precipitation averages 1187.5 Millimeters. Brookville is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.3 °C | 1 °C | 93.98 mm |
| February | -7.9 °C | 2.6 °C | 68.83 mm |
| March | -4.2 °C | 7.6 °C | 91.44 mm |
| April | 1.3 °C | 15.4 °C | 103.89 mm |
| May | 7.2 °C | 21.4 °C | 101.35 mm |
| June | 12.1 °C | 25.3 °C | 124.97 mm |
| July | 14.3 °C | 27.3 °C | 124.97 mm |
| August | 13.6 °C | 26.9 °C | 103.38 mm |
| September | 9.8 °C | 23.2 °C | 103.89 mm |
| October | 3.9 °C | 16.6 °C | 86.87 mm |
| November | -1.2 °C | 9.3 °C | 88.39 mm |
| December | -4.9 °C | 3.3 °C | 95.5 mm |
| Annual | 3 °C | 15 °C | 1187.46 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |