| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F | |
| 2012 Hardiness Zone: | Zone 7a: 0°F to 5°F | |
| 1990 Hardiness Zone: | Zone 7a: 0F to 5F | |
| Average First Frost Date: | Nov. 1 - Nov. 10 | |
| Average Last Frost Date: | Apr. 11 - Apr. 20 | |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 64c - Piedmont Uplands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 19803 - Wilmington, DE | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 25 | 33 | 42 | 52 | 61 | 66 | 65 | 58 | 46 | 37 | 29 | 45 |
| Avg Max Temp (°F) | 39 | 42 | 51 | 62 | 72 | 81 | 85 | 84 | 76 | 65 | 54 | 44 | 63 |
| Avg Precip (In.) | 3.82 | 2.97 | 4.2 | 3.84 | 4.46 | 4.03 | 4.38 | 3.94 | 4.53 | 3.39 | 3.7 | 3.72 | 46.97 |