Louisa, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.3 °C (low) to 20 °C (high). Annual precipitation averages 1160.8 Millimeters. Louisa is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.6 °C | 6.9 °C | 84.84 mm |
| February | -3.4 °C | 9.2 °C | 82.3 mm |
| March | -0.1 °C | 14.6 °C | 110.24 mm |
| April | 5.3 °C | 21.3 °C | 95.25 mm |
| May | 10.9 °C | 25.3 °C | 122.94 mm |
| June | 15.5 °C | 29.1 °C | 111 mm |
| July | 17.9 °C | 30.8 °C | 128.27 mm |
| August | 17.3 °C | 30.4 °C | 92.96 mm |
| September | 13.2 °C | 27.3 °C | 82.3 mm |
| October | 5.8 °C | 21.2 °C | 77.72 mm |
| November | 0.3 °C | 14.6 °C | 78.23 mm |
| December | -2.3 °C | 8.8 °C | 94.74 mm |
| Annual | 6.3 °C | 20 °C | 1160.79 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |