| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°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: | 57d - Marblehead Drift/Limestone Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 43449 - Oak Harbor, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 20 | 29 | 39 | 50 | 60 | 64 | 62 | 55 | 44 | 34 | 24 | 42 |
| Avg Max Temp (°F) | 32 | 35 | 45 | 57 | 69 | 79 | 83 | 81 | 75 | 63 | 49 | 37 | 59 |
| Avg Precip (In.) | 1.83 | 1.57 | 2.52 | 3.15 | 3.33 | 3.91 | 3.26 | 3.58 | 3.24 | 2.46 | 2.92 | 2.55 | 34.32 |