| 2023 Hardiness Zone: | Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F |
| 2012 Hardiness Zone: | Zone 7b: 5°F to 10°F 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. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 63f - Delmarva Uplands |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 19966 - Millsboro, DE | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 26 | 27 | 34 | 42 | 52 | 61 | 66 | 65 | 58 | 46 | 38 | 30 | 45 |
| Avg Max Temp (°F) | 44 | 46 | 55 | 65 | 74 | 82 | 87 | 85 | 79 | 68 | 58 | 49 | 66 |
| Avg Precip (In.) | 3.97 | 3.19 | 4.51 | 3.41 | 3.84 | 3.32 | 3.87 | 5.32 | 3.89 | 3.41 | 3.24 | 3.44 | 45.42 |