Kelleys Island, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.7 °F (low) to 56.5 °F (high). Annual precipitation averages 35.6 Inches. Kelleys Island is located in USDA Plant Hardiness Zone 7a. 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 | 21.1 °F | 31.9 °F | 2.18 in. |
| February | 22.3 °F | 34.0 °F | 1.98 in. |
| March | 29.2 °F | 41.8 °F | 2.57 in. |
| April | 40.0 °F | 53.8 °F | 3.57 in. |
| May | 52.1 °F | 65.0 °F | 3.67 in. |
| June | 62.7 °F | 75.0 °F | 3.5 in. |
| July | 67.5 °F | 79.7 °F | 3.2 in. |
| August | 66.9 °F | 78.3 °F | 3.53 in. |
| September | 60.4 °F | 72.2 °F | 3.19 in. |
| October | 48.8 °F | 61.0 °F | 3.3 in. |
| November | 37.8 °F | 48.0 °F | 2.57 in. |
| December | 28.1 °F | 37.4 °F | 2.29 in. |
| Annual | 44.7 °F | 56.5 °F | 35.55 in. |
| 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 7a : 0°F to 5°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 |