| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°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: | 57c - Paulding Plains |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 43512 - Defiance, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 19 | 28 | 38 | 49 | 59 | 63 | 60 | 53 | 42 | 33 | 23 | 40 |
| Avg Max Temp (°F) | 31 | 35 | 46 | 59 | 71 | 80 | 84 | 82 | 75 | 63 | 49 | 36 | 59 |
| Avg Precip (In.) | 1.94 | 1.83 | 2.63 | 3.29 | 3.62 | 3.81 | 3.83 | 3.26 | 3.18 | 2.57 | 2.93 | 2.63 | 35.51 |