| 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: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 19977 - Smyrna, DE | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 25 | 27 | 34 | 42 | 52 | 61 | 66 | 65 | 58 | 46 | 37 | 30 | 45 |
| Avg Max Temp (°F) | 42 | 46 | 55 | 65 | 75 | 83 | 87 | 86 | 79 | 68 | 57 | 47 | 66 |
| Avg Precip (In.) | 3.58 | 2.83 | 4.09 | 3.44 | 4.17 | 3.74 | 4.04 | 3.91 | 4.21 | 3.37 | 3.27 | 3.49 | 44.15 |