Galena, Indiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.5 °F (low) to 66 °F (high). Annual precipitation averages 49.3 Inches. Galena is located in USDA Plant Hardiness Zone 6b. 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 | 24.0 °F | 41.1 °F | 3.71 in. |
| February | 26.6 °F | 45.9 °F | 3.43 in. |
| March | 34.3 °F | 55.7 °F | 4.34 in. |
| April | 44.3 °F | 67.2 °F | 5.12 in. |
| May | 54.6 °F | 75.8 °F | 5.39 in. |
| June | 63.0 °F | 83.4 °F | 4.76 in. |
| July | 66.5 °F | 86.6 °F | 4.03 in. |
| August | 65.1 °F | 85.9 °F | 3.19 in. |
| September | 57.5 °F | 80.2 °F | 3.72 in. |
| October | 45.8 °F | 68.8 °F | 3.7 in. |
| November | 35.5 °F | 55.9 °F | 3.69 in. |
| December | 28.3 °F | 45.0 °F | 4.24 in. |
| Annual | 45.5 °F | 66 °F | 49.32 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 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |