Vermilion, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.7 °C (low) to 14.6 °C (high). Annual precipitation averages 959.6 Millimeters. Vermilion 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 | -6.1 °C | 1 °C | 67.56 mm |
| February | -5.4 °C | 2.2 °C | 54.61 mm |
| March | -1.5 °C | 6.4 °C | 70.1 mm |
| April | 4.9 °C | 13.3 °C | 91.44 mm |
| May | 11.4 °C | 19.7 °C | 93.22 mm |
| June | 16.8 °C | 25 °C | 94.23 mm |
| July | 19 °C | 27.3 °C | 88.9 mm |
| August | 18.4 °C | 26.2 °C | 89.41 mm |
| September | 14.5 °C | 23.1 °C | 88.39 mm |
| October | 8.3 °C | 17 °C | 81.28 mm |
| November | 2.6 °C | 9.7 °C | 72.9 mm |
| December | -2.5 °C | 3.8 °C | 67.56 mm |
| Annual | 6.7 °C | 14.6 °C | 959.6 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 |