Corydon, Indiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.3 °F (low) to 67.3 °F (high). Annual precipitation averages 49.6 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 | 25.0 °F | 42.7 °F | 3.69 in. |
| February | 27.6 °F | 47.3 °F | 3.52 in. |
| March | 35.2 °F | 57.1 °F | 4.69 in. |
| April | 45.1 °F | 68.5 °F | 5.03 in. |
| May | 55.2 °F | 76.9 °F | 5.28 in. |
| June | 63.8 °F | 84.6 °F | 4.71 in. |
| July | 67.4 °F | 87.7 °F | 4.15 in. |
| August | 65.8 °F | 87.0 °F | 3.13 in. |
| September | 58.2 °F | 81.4 °F | 3.76 in. |
| October | 46.6 °F | 70.3 °F | 3.64 in. |
| November | 36.1 °F | 57.2 °F | 3.71 in. |
| December | 29.2 °F | 46.4 °F | 4.3 in. |
| Annual | 46.3 °F | 67.3 °F | 49.61 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 |