| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 55b - Loamy High Lime Till Plains |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 45042 - Middletown, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 22 | 30 | 39 | 49 | 59 | 63 | 61 | 53 | 41 | 33 | 24 | 41 |
| Avg Max Temp (°F) | 37 | 41 | 52 | 64 | 74 | 83 | 86 | 85 | 78 | 67 | 53 | 42 | 63 |
| Avg Precip (In.) | 2.63 | 2.38 | 3.17 | 3.84 | 4.49 | 3.85 | 4.05 | 3.44 | 2.8 | 2.96 | 3.37 | 2.99 | 39.97 |