Middletown, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.5 °F (low) to 64.3 °F (high). Annual precipitation averages 41.3 Inches. Middletown 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 | 22.2 °F | 38.6 °F | 3.1 in. |
| February | 24.1 °F | 42.5 °F | 2.38 in. |
| March | 31.9 °F | 52.6 °F | 3.6 in. |
| April | 41.9 °F | 65.0 °F | 4.32 in. |
| May | 52.6 °F | 74.8 °F | 4.45 in. |
| June | 61.7 °F | 82.8 °F | 4.58 in. |
| July | 65.1 °F | 86.1 °F | 3.78 in. |
| August | 63.4 °F | 85.5 °F | 3.07 in. |
| September | 55.1 °F | 79.6 °F | 2.74 in. |
| October | 43.4 °F | 67.5 °F | 2.97 in. |
| November | 33.3 °F | 53.9 °F | 2.96 in. |
| December | 27.0 °F | 42.9 °F | 3.31 in. |
| Annual | 43.5 °F | 64.3 °F | 41.26 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 |