Brownstown, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.4 °F (low) to 64.6 °F (high). Annual precipitation averages 49.2 Inches. Brownstown 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.2 °F | 39.1 °F | 3.66 in. |
| February | 24.5 °F | 43.8 °F | 2.96 in. |
| March | 32.1 °F | 53.9 °F | 4.15 in. |
| April | 42.0 °F | 65.8 °F | 5.33 in. |
| May | 53.0 °F | 74.8 °F | 5.38 in. |
| June | 61.4 °F | 82.6 °F | 5.06 in. |
| July | 64.8 °F | 85.6 °F | 4.19 in. |
| August | 62.8 °F | 85.0 °F | 3.87 in. |
| September | 55.0 °F | 79.3 °F | 3.4 in. |
| October | 43.0 °F | 67.6 °F | 3.61 in. |
| November | 33.5 °F | 54.4 °F | 3.86 in. |
| December | 26.3 °F | 43.2 °F | 3.77 in. |
| Annual | 43.4 °F | 64.6 °F | 49.24 in. |
| 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 6b : -5°F to 0°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 |