Corydon, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.2 °C (low) to 19.5 °C (high). Annual precipitation averages 1186.4 Millimeters. 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 | -3.8 °C | 5.3 °C | 86.87 mm |
| February | -2.3 °C | 8.1 °C | 82.3 mm |
| March | 2.1 °C | 13.5 °C | 111.76 mm |
| April | 7.8 °C | 20.1 °C | 125.98 mm |
| May | 13.7 °C | 25.1 °C | 128.27 mm |
| June | 18.4 °C | 29.4 °C | 106.68 mm |
| July | 20.2 °C | 31 °C | 104.39 mm |
| August | 18.7 °C | 30.4 °C | 73.66 mm |
| September | 14.5 °C | 27.9 °C | 82.8 mm |
| October | 8.5 °C | 21.5 °C | 87.63 mm |
| November | 2.3 °C | 13.7 °C | 96.52 mm |
| December | -1.7 °C | 7.7 °C | 99.57 mm |
| Annual | 8.2 °C | 19.5 °C | 1186.43 mm |
| 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 : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |