| 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: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 55b - Loamy High Lime Till Plains |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 45409 - Dayton, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 20 | 23 | 32 | 41 | 52 | 61 | 66 | 63 | 56 | 44 | 35 | 25 | 43 |
| Avg Max Temp (°F) | 35 | 40 | 51 | 63 | 73 | 82 | 86 | 85 | 78 | 66 | 52 | 40 | 63 |
| Avg Precip (In.) | 2.61 | 2.36 | 3.08 | 3.92 | 4.38 | 4.16 | 3.97 | 3.4 | 2.67 | 2.71 | 3.26 | 2.89 | 39.42 |