Mentone, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.8 °F (low) to 59.6 °F (high). Annual precipitation averages 39.9 Inches. 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 | 17.6 °F | 32.1 °F | 2.58 in. |
| February | 19.9 °F | 35.9 °F | 2.16 in. |
| March | 28.2 °F | 47.0 °F | 2.47 in. |
| April | 38.7 °F | 59.8 °F | 3.74 in. |
| May | 50.0 °F | 70.9 °F | 4.43 in. |
| June | 59.6 °F | 80.1 °F | 4.48 in. |
| July | 62.8 °F | 83.2 °F | 4.32 in. |
| August | 61.0 °F | 81.4 °F | 4.01 in. |
| September | 53.4 °F | 75.8 °F | 3.16 in. |
| October | 42.4 °F | 63.2 °F | 3.06 in. |
| November | 32.4 °F | 48.9 °F | 3.08 in. |
| December | 23.5 °F | 37.0 °F | 2.37 in. |
| Annual | 40.8 °F | 59.6 °F | 39.86 in. |
| 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 : -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 |