Brownstown, Pennsylvania has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.5 °F (low) to 60.3 °F (high). Annual precipitation averages 48.8 Inches. 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 | 18.9 °F | 35.5 °F | 3.72 in. |
| February | 20.4 °F | 38.4 °F | 3.36 in. |
| March | 27.0 °F | 47.1 °F | 4.12 in. |
| April | 37.6 °F | 61.2 °F | 4.31 in. |
| May | 47.5 °F | 71.1 °F | 4.31 in. |
| June | 55.9 °F | 78.5 °F | 4.66 in. |
| July | 59.9 °F | 82.4 °F | 4.52 in. |
| August | 58.3 °F | 81.1 °F | 4.39 in. |
| September | 51.7 °F | 74.7 °F | 4.36 in. |
| October | 40.5 °F | 62.9 °F | 3.56 in. |
| November | 31.3 °F | 50.6 °F | 3.61 in. |
| December | 24.4 °F | 40.0 °F | 3.88 in. |
| Annual | 39.5 °F | 60.3 °F | 48.8 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |