Maineville, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.8 °C (low) to 17.8 °C (high). Annual precipitation averages 1123.2 Millimeters. 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 | -5.2 °C | 3.8 °C | 83.06 mm |
| February | -4.1 °C | 6.1 °C | 70.36 mm |
| March | 0.3 °C | 11.5 °C | 99.31 mm |
| April | 6 °C | 18.3 °C | 117.09 mm |
| May | 11.8 °C | 23.4 °C | 125.73 mm |
| June | 16.8 °C | 27.9 °C | 114.05 mm |
| July | 18.7 °C | 29.8 °C | 104.9 mm |
| August | 17.6 °C | 29.4 °C | 90.93 mm |
| September | 13.6 °C | 26.1 °C | 72.64 mm |
| October | 7.1 °C | 19.5 °C | 78.49 mm |
| November | 1.3 °C | 12 °C | 79.25 mm |
| December | -2.4 °C | 6.1 °C | 87.38 mm |
| Annual | 6.8 °C | 17.8 °C | 1123.19 mm |
| 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 : -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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |