| 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: | Nov. 1 - Nov. 10 | |
| Average Last Frost Date: | Apr. 11 - Apr. 20 | |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate | |
| Ecoregion: | 63f - Delmarva Uplands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 15 - 30 days Over 86°F |
Annual Climate Data for ZIP Code 19901 - Dover, DE | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 27 | 28 | 35 | 43 | 53 | 62 | 68 | 66 | 60 | 48 | 39 | 31 | 47 |
| Avg Max Temp (°F) | 44 | 47 | 55 | 66 | 75 | 83 | 88 | 86 | 80 | 69 | 58 | 48 | 66 |
| Avg Precip (In.) | 3.88 | 2.99 | 4.36 | 3.47 | 4.25 | 3.76 | 4.14 | 4.52 | 4.51 | 3.31 | 3.18 | 3.51 | 45.88 |