Brownsburg, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.3 °C (low) to 16.5 °C (high). Annual precipitation averages 1124.5 Millimeters. 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 | -6.9 °C | 1.7 °C | 76.96 mm |
| February | -5.3 °C | 3.9 °C | 64.77 mm |
| March | -0.4 °C | 9.9 °C | 85.34 mm |
| April | 5.6 °C | 16.9 °C | 115.06 mm |
| May | 11.8 °C | 22.6 °C | 120.9 mm |
| June | 16.7 °C | 27.2 °C | 133.86 mm |
| July | 18.6 °C | 29 °C | 113.54 mm |
| August | 17.7 °C | 28.3 °C | 82.55 mm |
| September | 13.4 °C | 25.3 °C | 87.12 mm |
| October | 6.9 °C | 18.4 °C | 84.07 mm |
| November | 1 °C | 10.7 °C | 84.84 mm |
| December | -3.9 °C | 4.2 °C | 75.44 mm |
| Annual | 6.3 °C | 16.5 °C | 1124.45 mm |
| 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 : -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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |