| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F |
| 2012 Hardiness Zone: | Zone 7a: 0°F to 5°F |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F |
| 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 21635 - Galena, MD | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 26 | 33 | 42 | 52 | 61 | 65 | 64 | 57 | 45 | 36 | 28 | 44 |
| Avg Max Temp (°F) | 42 | 45 | 55 | 65 | 75 | 83 | 87 | 86 | 79 | 68 | 57 | 47 | 66 |
| Avg Precip (In.) | 3.53 | 2.88 | 4.09 | 3.37 | 4.26 | 3.91 | 4.02 | 3.94 | 4.22 | 3.37 | 3.26 | 3.56 | 44.42 |