| 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 |
| 1990 Hardiness Zone: | Zone 7b: 5F to 10F |
| Average First Frost Date: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 63d - Virginian Barrier Islands and Coastal Marshes |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 19958 - Lewes, DE | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 28 | 29 | 36 | 44 | 54 | 63 | 68 | 67 | 61 | 49 | 41 | 32 | 48 |
| Avg Max Temp (°F) | 44 | 47 | 54 | 64 | 73 | 81 | 86 | 84 | 79 | 68 | 59 | 49 | 66 |
| Avg Precip (In.) | 4 | 3.2 | 4.45 | 3.53 | 3.89 | 3.19 | 4.1 | 5.24 | 3.71 | 3.39 | 3.3 | 3.65 | 45.63 |