Kelleys Island, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.1 °C (low) to 13.6 °C (high). Annual precipitation averages 903 Millimeters. 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 | -6.1 °C | -0.1 °C | 55.37 mm |
| February | -5.4 °C | 1.1 °C | 50.29 mm |
| March | -1.6 °C | 5.4 °C | 65.28 mm |
| April | 4.4 °C | 12.1 °C | 90.68 mm |
| May | 11.2 °C | 18.3 °C | 93.22 mm |
| June | 17.1 °C | 23.9 °C | 88.9 mm |
| July | 19.7 °C | 26.5 °C | 81.28 mm |
| August | 19.4 °C | 25.7 °C | 89.66 mm |
| September | 15.8 °C | 22.3 °C | 81.03 mm |
| October | 9.3 °C | 16.1 °C | 83.82 mm |
| November | 3.2 °C | 8.9 °C | 65.28 mm |
| December | -2.2 °C | 3 °C | 58.17 mm |
| Annual | 7.1 °C | 13.6 °C | 902.98 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 7a : -17.8°C to -15°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 |