Peninsula, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.7 °C (low) to 15.8 °C (high). Annual precipitation averages 1027.7 Millimeters. Peninsula 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 | -6.3 °C | 1.8 °C | 70.87 mm |
| February | -5.8 °C | 3.1 °C | 55.63 mm |
| March | -1.8 °C | 8.1 °C | 78.49 mm |
| April | 4.2 °C | 15.3 °C | 92.96 mm |
| May | 10 °C | 22 °C | 103.89 mm |
| June | 15.2 °C | 26.6 °C | 105.41 mm |
| July | 17.3 °C | 28.9 °C | 104.14 mm |
| August | 16.4 °C | 27.9 °C | 91.69 mm |
| September | 12.7 °C | 24.1 °C | 93.47 mm |
| October | 7 °C | 17.3 °C | 83.31 mm |
| November | 1.9 °C | 10.4 °C | 74.68 mm |
| December | -2.9 °C | 4.3 °C | 73.15 mm |
| Annual | 5.7 °C | 15.8 °C | 1027.69 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |