| 2023 Hardiness Zone: | 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: | Oct. 21 - Oct. 31 |
| 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 19973 - Seaford, 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 | 64 | 58 | 46 | 38 | 30 | 45 |
| Avg Max Temp (°F) | 44 | 47 | 55 | 66 | 75 | 83 | 87 | 86 | 80 | 69 | 59 | 49 | 67 |
| Avg Precip (In.) | 3.96 | 3.21 | 4.44 | 3.39 | 3.86 | 3.43 | 3.93 | 5.06 | 4 | 3.36 | 3.22 | 3.43 | 45.3 |