Brownsburg, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.3 °F (low) to 61.7 °F (high). Annual precipitation averages 44.3 Inches. Brownsburg 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.6 °F | 35.1 °F | 3.03 in. |
| February | 22.4 °F | 39.1 °F | 2.55 in. |
| March | 31.2 °F | 49.9 °F | 3.36 in. |
| April | 42.1 °F | 62.5 °F | 4.53 in. |
| May | 53.2 °F | 72.6 °F | 4.76 in. |
| June | 62.1 °F | 80.9 °F | 5.27 in. |
| July | 65.4 °F | 84.2 °F | 4.47 in. |
| August | 63.8 °F | 83.0 °F | 3.25 in. |
| September | 56.1 °F | 77.6 °F | 3.43 in. |
| October | 44.5 °F | 65.2 °F | 3.31 in. |
| November | 33.8 °F | 51.2 °F | 3.34 in. |
| December | 25.0 °F | 39.6 °F | 2.97 in. |
| Annual | 43.3 °F | 61.7 °F | 44.27 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |