Maineville, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.2 °F (low) to 64.1 °F (high). Annual precipitation averages 44.2 Inches. Maineville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.6 °F | 38.8 °F | 3.27 in. |
| February | 24.6 °F | 42.9 °F | 2.77 in. |
| March | 32.6 °F | 52.7 °F | 3.91 in. |
| April | 42.8 °F | 64.9 °F | 4.61 in. |
| May | 53.3 °F | 74.1 °F | 4.95 in. |
| June | 62.2 °F | 82.2 °F | 4.49 in. |
| July | 65.6 °F | 85.6 °F | 4.13 in. |
| August | 63.6 °F | 84.9 °F | 3.58 in. |
| September | 56.4 °F | 78.9 °F | 2.86 in. |
| October | 44.7 °F | 67.1 °F | 3.09 in. |
| November | 34.4 °F | 53.6 °F | 3.12 in. |
| December | 27.6 °F | 43.0 °F | 3.44 in. |
| Annual | 44.2 °F | 64.1 °F | 44.22 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |