Roachdale, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.5 °C (low) to 16.2 °C (high). Annual precipitation averages 1120.1 Millimeters. Roachdale 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.2 °C | 1.5 °C | 75.18 mm |
| February | -5.8 °C | 3.8 °C | 63.25 mm |
| March | -0.9 °C | 9.8 °C | 82.04 mm |
| April | 4.9 °C | 16.5 °C | 116.08 mm |
| May | 11.1 °C | 22.3 °C | 120.14 mm |
| June | 16.1 °C | 27 °C | 131.06 mm |
| July | 17.6 °C | 28.5 °C | 114.3 mm |
| August | 16.3 °C | 27.8 °C | 85.34 mm |
| September | 12.2 °C | 25.1 °C | 85.09 mm |
| October | 5.9 °C | 18.2 °C | 85.6 mm |
| November | 0.3 °C | 10.4 °C | 88.14 mm |
| December | -4.5 °C | 3.9 °C | 73.91 mm |
| Annual | 5.5 °C | 16.2 °C | 1120.13 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |