Geneva, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.5 °C (low) to 14.3 °C (high). Annual precipitation averages 1086.1 Millimeters. Geneva 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 | -6.6 °C | 1.2 °C | 76.2 mm |
| February | -6.5 °C | 1.9 °C | 56.64 mm |
| March | -2.7 °C | 6.1 °C | 71.88 mm |
| April | 3.4 °C | 13.5 °C | 97.54 mm |
| May | 9.6 °C | 19.6 °C | 92.46 mm |
| June | 14.9 °C | 24.4 °C | 102.36 mm |
| July | 17.6 °C | 26.6 °C | 104.65 mm |
| August | 16.9 °C | 25.8 °C | 90.93 mm |
| September | 13.1 °C | 22.6 °C | 109.22 mm |
| October | 7.4 °C | 16.2 °C | 103.38 mm |
| November | 1.9 °C | 9.9 °C | 90.93 mm |
| December | -2.7 °C | 3.9 °C | 89.92 mm |
| Annual | 5.5 °C | 14.3 °C | 1086.11 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 |