Columbus, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.8 °C (low) to 20.6 °C (high). Annual precipitation averages 1313.7 Millimeters. Columbus 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 | -2.7 °C | 7.2 °C | 98.3 mm |
| February | -1.1 °C | 9.9 °C | 102.36 mm |
| March | 3.3 °C | 15.4 °C | 119.38 mm |
| April | 8.4 °C | 21 °C | 133.6 mm |
| May | 14.1 °C | 25.9 °C | 138.43 mm |
| June | 18.7 °C | 30.4 °C | 102.87 mm |
| July | 20.6 °C | 32 °C | 105.66 mm |
| August | 19.2 °C | 31.3 °C | 79.76 mm |
| September | 14.8 °C | 28.2 °C | 91.19 mm |
| October | 8.6 °C | 22.2 °C | 107.19 mm |
| November | 2.7 °C | 14.8 °C | 113.79 mm |
| December | -1.2 °C | 9.1 °C | 121.16 mm |
| Annual | 8.8 °C | 20.6 °C | 1313.69 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 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |