| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F 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: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 55a - Clayey High Lime Till Plains |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 43015 - Delaware, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 19 | 28 | 37 | 48 | 58 | 62 | 60 | 52 | 40 | 32 | 23 | 40 |
| Avg Max Temp (°F) | 34 | 38 | 49 | 61 | 72 | 81 | 85 | 83 | 77 | 64 | 50 | 39 | 61 |
| Avg Precip (In.) | 2.33 | 1.95 | 2.61 | 3.48 | 3.98 | 4.19 | 4.1 | 3.66 | 2.94 | 2.5 | 3.25 | 2.76 | 37.75 |