| 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 1b: -15F to -10F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| 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: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 45426 - Dayton, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 22 | 31 | 40 | 51 | 61 | 65 | 62 | 55 | 43 | 34 | 25 | 42 |
| Avg Max Temp (°F) | 35 | 39 | 50 | 62 | 73 | 82 | 86 | 84 | 77 | 65 | 51 | 40 | 62 |
| Avg Precip (In.) | 2.56 | 2.31 | 3.08 | 3.83 | 4.38 | 4.18 | 3.97 | 3.47 | 2.71 | 2.72 | 3.25 | 2.89 | 39.35 |