| 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. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 57a - Maumee Lake Plains |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 43515 - Delta, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 18 | 27 | 37 | 48 | 58 | 61 | 59 | 52 | 41 | 31 | 22 | 39 |
| Avg Max Temp (°F) | 31 | 35 | 46 | 59 | 71 | 80 | 84 | 82 | 75 | 63 | 49 | 36 | 59 |
| Avg Precip (In.) | 1.93 | 1.78 | 2.58 | 3.28 | 3.39 | 3.77 | 3.38 | 3.49 | 3.02 | 2.51 | 2.88 | 2.57 | 34.57 |