| 2023 Hardiness Zone: | 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: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 63f - Delmarva Uplands |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 21830 - Hebron, MD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 27 | 29 | 36 | 44 | 53 | 62 | 67 | 66 | 59 | 48 | 39 | 31 | 47 |
| Avg Max Temp (°F) | 45 | 48 | 57 | 67 | 76 | 84 | 88 | 86 | 80 | 70 | 59 | 50 | 67 |
| Avg Precip (In.) | 3.97 | 3.32 | 4.4 | 3.34 | 3.68 | 3.53 | 4.27 | 4.79 | 3.97 | 3.31 | 3.19 | 3.43 | 45.2 |