Corydon, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.8 °F (low) to 67.1 °F (high). Annual precipitation averages 46.7 Inches. Corydon is located in USDA Plant Hardiness Zone 7a. 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 | 25.1 °F | 41.6 °F | 3.42 in. |
| February | 27.8 °F | 46.6 °F | 3.24 in. |
| March | 35.8 °F | 56.3 °F | 4.4 in. |
| April | 46.0 °F | 68.1 °F | 4.96 in. |
| May | 56.7 °F | 77.1 °F | 5.05 in. |
| June | 65.2 °F | 85.0 °F | 4.2 in. |
| July | 68.4 °F | 87.8 °F | 4.11 in. |
| August | 65.7 °F | 86.8 °F | 2.9 in. |
| September | 58.1 °F | 82.2 °F | 3.26 in. |
| October | 47.3 °F | 70.7 °F | 3.45 in. |
| November | 36.1 °F | 56.6 °F | 3.8 in. |
| December | 29.0 °F | 45.9 °F | 3.92 in. |
| Annual | 46.8 °F | 67.1 °F | 46.71 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 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |