Mentone, 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 15.3 °C (high). Annual precipitation averages 1012.4 Millimeters. Mentone 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 | -8 °C | 0.1 °C | 65.53 mm |
| February | -6.7 °C | 2.2 °C | 54.86 mm |
| March | -2.1 °C | 8.3 °C | 62.74 mm |
| April | 3.7 °C | 15.4 °C | 95 mm |
| May | 10 °C | 21.6 °C | 112.52 mm |
| June | 15.3 °C | 26.7 °C | 113.79 mm |
| July | 17.1 °C | 28.4 °C | 109.73 mm |
| August | 16.1 °C | 27.4 °C | 101.85 mm |
| September | 11.9 °C | 24.3 °C | 80.26 mm |
| October | 5.8 °C | 17.3 °C | 77.72 mm |
| November | 0.2 °C | 9.4 °C | 78.23 mm |
| December | -4.7 °C | 2.8 °C | 60.2 mm |
| Annual | 4.9 °C | 15.3 °C | 1012.43 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |