Harbor Hills, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.6 °F (low) to 61.7 °F (high). Annual precipitation averages 42.8 Inches. Harbor Hills is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.9 °F | 36.3 °F | 3.27 in. |
| February | 21.6 °F | 39.4 °F | 2.56 in. |
| March | 29.7 °F | 49.5 °F | 3.68 in. |
| April | 40.2 °F | 62.6 °F | 4.01 in. |
| May | 50.6 °F | 72.3 °F | 4.15 in. |
| June | 59.6 °F | 80.5 °F | 4.49 in. |
| July | 63.0 °F | 83.5 °F | 4.47 in. |
| August | 61.1 °F | 82.3 °F | 3.64 in. |
| September | 53.7 °F | 76.7 °F | 3.36 in. |
| October | 42.1 °F | 64.7 °F | 2.94 in. |
| November | 32.5 °F | 51.7 °F | 3.01 in. |
| December | 25.3 °F | 40.7 °F | 3.17 in. |
| Annual | 41.6 °F | 61.7 °F | 42.75 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |