Mentor, Kentucky has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7 °C (low) to 18.4 °C (high). Annual precipitation averages 1122.4 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.7 °C | 4.6 °C | 80.26 mm |
| February | -3.4 °C | 6.9 °C | 74.42 mm |
| March | 0.6 °C | 12.2 °C | 106.43 mm |
| April | 6.1 °C | 18.9 °C | 109.98 mm |
| May | 11.8 °C | 23.8 °C | 123.95 mm |
| June | 16.6 °C | 28.4 °C | 111.51 mm |
| July | 18.8 °C | 30.2 °C | 117.86 mm |
| August | 18 °C | 29.7 °C | 84.33 mm |
| September | 13.8 °C | 26.6 °C | 75.69 mm |
| October | 7.2 °C | 20.2 °C | 74.17 mm |
| November | 1.6 °C | 12.7 °C | 77.98 mm |
| December | -1.9 °C | 6.9 °C | 85.85 mm |
| Annual | 7 °C | 18.4 °C | 1122.43 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 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 |