Mentor, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.9 °C (low) to 14.6 °C (high). Annual precipitation averages 1152.7 Millimeters. Mentor is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.2 °C | 1.3 °C | 88.9 mm |
| February | -6 °C | 2.3 °C | 61.98 mm |
| March | -2.3 °C | 6.6 °C | 79.5 mm |
| April | 3.9 °C | 13.9 °C | 90.17 mm |
| May | 10 °C | 19.9 °C | 99.06 mm |
| June | 15.4 °C | 24.9 °C | 101.6 mm |
| July | 17.8 °C | 26.9 °C | 116.08 mm |
| August | 17.2 °C | 26.2 °C | 103.89 mm |
| September | 13.6 °C | 22.9 °C | 107.7 mm |
| October | 7.8 °C | 16.4 °C | 111.51 mm |
| November | 2.2 °C | 9.9 °C | 97.79 mm |
| December | -2.6 °C | 4.1 °C | 94.49 mm |
| Annual | 5.9 °C | 14.6 °C | 1152.67 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |