Peninsula, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 42.2 °F (low) to 60.5 °F (high). Annual precipitation averages 40.5 Inches. 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 | 20.7 °F | 35.2 °F | 2.79 in. |
| February | 21.5 °F | 37.6 °F | 2.19 in. |
| March | 28.7 °F | 46.5 °F | 3.09 in. |
| April | 39.6 °F | 59.5 °F | 3.66 in. |
| May | 50.0 °F | 71.6 °F | 4.09 in. |
| June | 59.3 °F | 79.8 °F | 4.15 in. |
| July | 63.2 °F | 84.0 °F | 4.1 in. |
| August | 61.6 °F | 82.3 °F | 3.61 in. |
| September | 54.9 °F | 75.4 °F | 3.68 in. |
| October | 44.6 °F | 63.2 °F | 3.28 in. |
| November | 35.5 °F | 50.8 °F | 2.94 in. |
| December | 26.8 °F | 39.8 °F | 2.88 in. |
| Annual | 42.2 °F | 60.5 °F | 40.46 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |