Galena, Maryland has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.4 °F (low) to 65.3 °F (high). Annual precipitation averages 46.6 Inches. Galena is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.7 °F | 42.5 °F | 3.26 in. |
| February | 25.8 °F | 44.9 °F | 2.91 in. |
| March | 33.0 °F | 53.0 °F | 4.16 in. |
| April | 43.1 °F | 64.7 °F | 3.6 in. |
| May | 52.7 °F | 73.8 °F | 3.91 in. |
| June | 62.0 °F | 82.5 °F | 4.86 in. |
| July | 67.1 °F | 86.9 °F | 4.45 in. |
| August | 65.1 °F | 85.1 °F | 4.14 in. |
| September | 58.4 °F | 79.2 °F | 4.42 in. |
| October | 46.4 °F | 67.7 °F | 3.93 in. |
| November | 36.5 °F | 56.6 °F | 3.05 in. |
| December | 29.6 °F | 46.8 °F | 3.89 in. |
| Annual | 45.4 °F | 65.3 °F | 46.58 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |