| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°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: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 63f - Delmarva Uplands |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 19952 - Harrington, DE | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 25 | 26 | 34 | 42 | 52 | 61 | 66 | 64 | 57 | 46 | 37 | 30 | 45 |
| Avg Max Temp (°F) | 43 | 46 | 55 | 65 | 75 | 83 | 88 | 85 | 79 | 69 | 58 | 48 | 66 |
| Avg Precip (In.) | 3.96 | 3.08 | 4.36 | 3.44 | 4.11 | 3.44 | 3.83 | 4.42 | 4.13 | 3.39 | 3.28 | 3.52 | 44.96 |