Vermilion, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.1 °F (low) to 58.2 °F (high). Annual precipitation averages 37.8 Inches. 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 | 21.0 °F | 33.8 °F | 2.66 in. |
| February | 22.3 °F | 35.9 °F | 2.15 in. |
| March | 29.3 °F | 43.6 °F | 2.76 in. |
| April | 40.9 °F | 56.0 °F | 3.6 in. |
| May | 52.5 °F | 67.4 °F | 3.67 in. |
| June | 62.3 °F | 77.0 °F | 3.71 in. |
| July | 66.2 °F | 81.1 °F | 3.5 in. |
| August | 65.2 °F | 79.1 °F | 3.52 in. |
| September | 58.1 °F | 73.6 °F | 3.48 in. |
| October | 47.0 °F | 62.6 °F | 3.2 in. |
| November | 36.7 °F | 49.5 °F | 2.87 in. |
| December | 27.5 °F | 38.9 °F | 2.66 in. |
| Annual | 44.1 °F | 58.2 °F | 37.78 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |