| 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. 11 - Oct. 20 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 55b - Loamy High Lime Till Plains |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 45177 - Wilmington, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 21 | 30 | 39 | 50 | 59 | 63 | 60 | 53 | 41 | 33 | 24 | 41 |
| Avg Max Temp (°F) | 35 | 39 | 50 | 62 | 72 | 80 | 84 | 82 | 76 | 65 | 52 | 40 | 61 |
| Avg Precip (In.) | 2.71 | 2.51 | 3.38 | 3.95 | 4.86 | 4.25 | 4.21 | 3.51 | 2.93 | 2.83 | 3.35 | 2.93 | 41.42 |