| 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: | Dfa - Humid Continental Hot Summers | |
| Ecoregion: | 63f - Delmarva Uplands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 19720 - New Castle, DE | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 26 | 33 | 42 | 52 | 61 | 66 | 65 | 58 | 46 | 37 | 28 | 45 |
| Avg Max Temp (°F) | 40 | 43 | 52 | 63 | 73 | 82 | 86 | 85 | 78 | 66 | 55 | 45 | 64 |
| Avg Precip (In.) | 3.51 | 2.83 | 4 | 3.49 | 4.21 | 3.67 | 4.3 | 3.61 | 4.08 | 3.16 | 3.29 | 3.49 | 43.64 |