| 2023 Hardiness Zone: | 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: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 55c - Mad River Interlobate Area |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 45433 - Dayton, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 22 | 31 | 41 | 51 | 60 | 64 | 62 | 55 | 43 | 35 | 25 | 42 |
| Avg Max Temp (°F) | 35 | 40 | 51 | 62 | 73 | 82 | 86 | 84 | 77 | 65 | 52 | 40 | 62 |
| Avg Precip (In.) | 2.54 | 2.29 | 3.03 | 3.78 | 4.32 | 4.25 | 4.03 | 3.58 | 2.79 | 2.7 | 3.22 | 2.87 | 39.42 |