Brownstown, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.1 °C (low) to 15.7 °C (high). Annual precipitation averages 1239.5 Millimeters. Brownstown 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 | -7.3 °C | 1.9 °C | 94.49 mm |
| February | -6.4 °C | 3.6 °C | 85.34 mm |
| March | -2.8 °C | 8.4 °C | 104.65 mm |
| April | 3.1 °C | 16.2 °C | 109.47 mm |
| May | 8.6 °C | 21.7 °C | 109.47 mm |
| June | 13.3 °C | 25.8 °C | 118.36 mm |
| July | 15.5 °C | 28 °C | 114.81 mm |
| August | 14.6 °C | 27.3 °C | 111.51 mm |
| September | 10.9 °C | 23.7 °C | 110.74 mm |
| October | 4.7 °C | 17.2 °C | 90.42 mm |
| November | -0.4 °C | 10.3 °C | 91.69 mm |
| December | -4.2 °C | 4.4 °C | 98.55 mm |
| Annual | 4.1 °C | 15.7 °C | 1239.5 mm |
| 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 : -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 |