Geneva-on-the-Lake, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 6 °C (low) to 13.8 °C (high). Annual precipitation averages 1041.4 Millimeters. Geneva-on-the-Lake is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.1 °C | 1.3 °C | 76.2 mm |
| February | -6 °C | 1.8 °C | 54.36 mm |
| March | -2.3 °C | 5.5 °C | 68.07 mm |
| April | 3.9 °C | 12.6 °C | 93.47 mm |
| May | 10.1 °C | 18.6 °C | 86.11 mm |
| June | 15.4 °C | 23.4 °C | 92.2 mm |
| July | 18 °C | 25.7 °C | 100.84 mm |
| August | 17.4 °C | 25.1 °C | 90.68 mm |
| September | 13.6 °C | 22 °C | 105.16 mm |
| October | 7.9 °C | 15.9 °C | 103.12 mm |
| November | 2.4 °C | 9.8 °C | 87.88 mm |
| December | -2.2 °C | 4.1 °C | 83.31 mm |
| Annual | 6 °C | 13.8 °C | 1041.4 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Dfb - Humid Continental Mild Summer, Wet All Year |