Middletown, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.2 °F (low) to 61.2 °F (high). Annual precipitation averages 43.5 Inches. Middletown 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 | 18.2 °F | 34.1 °F | 3.01 in. |
| February | 20.7 °F | 38.0 °F | 2.44 in. |
| March | 29.4 °F | 48.8 °F | 3.36 in. |
| April | 39.8 °F | 61.6 °F | 4.29 in. |
| May | 51.0 °F | 72.5 °F | 4.61 in. |
| June | 60.2 °F | 81.0 °F | 5.24 in. |
| July | 62.5 °F | 83.9 °F | 4.44 in. |
| August | 60.8 °F | 82.7 °F | 3.33 in. |
| September | 53.3 °F | 77.5 °F | 3.16 in. |
| October | 42.5 °F | 65.0 °F | 3.18 in. |
| November | 32.3 °F | 50.7 °F | 3.39 in. |
| December | 24.0 °F | 38.9 °F | 3.01 in. |
| Annual | 41.2 °F | 61.2 °F | 43.46 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 |