Fairport Harbor, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 6.6 °C (low) to 14.5 °C (high). Annual precipitation averages 1039.6 Millimeters. Fairport Harbor 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 | -5.6 °C | 1.6 °C | 77.98 mm |
| February | -5.3 °C | 2.3 °C | 54.86 mm |
| March | -1.9 °C | 6.3 °C | 72.14 mm |
| April | 4.2 °C | 13.4 °C | 91.95 mm |
| May | 10.6 °C | 19.3 °C | 87.88 mm |
| June | 16.1 °C | 24.3 °C | 90.17 mm |
| July | 18.7 °C | 26.5 °C | 106.68 mm |
| August | 18.1 °C | 26 °C | 91.19 mm |
| September | 14.4 °C | 22.9 °C | 101.09 mm |
| October | 8.6 °C | 16.7 °C | 102.36 mm |
| November | 3 °C | 10.2 °C | 85.09 mm |
| December | -1.9 °C | 4.3 °C | 78.23 mm |
| Annual | 6.6 °C | 14.5 °C | 1039.62 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 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 | Dfb - Humid Continental Mild Summer, Wet All Year |