Roanoke, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.9 °C (low) to 15.9 °C (high). Annual precipitation averages 1012.2 Millimeters. Roanoke 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 | -7.9 °C | 0.6 °C | 66.04 mm |
| February | -6.7 °C | 2.6 °C | 53.34 mm |
| March | -2.1 °C | 8.7 °C | 68.07 mm |
| April | 3.8 °C | 16.1 °C | 98.04 mm |
| May | 10 °C | 22.3 °C | 116.08 mm |
| June | 15.4 °C | 27.2 °C | 113.03 mm |
| July | 17.2 °C | 29 °C | 106.68 mm |
| August | 16 °C | 28.1 °C | 98.04 mm |
| September | 11.8 °C | 24.8 °C | 77.47 mm |
| October | 5.7 °C | 17.9 °C | 75.44 mm |
| November | 0.2 °C | 9.9 °C | 77.98 mm |
| December | -4.7 °C | 3.3 °C | 61.98 mm |
| Annual | 4.9 °C | 15.9 °C | 1012.19 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |