Louisa, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.9 °C (low) to 20 °C (high). Annual precipitation averages 1128.3 Millimeters. Louisa is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.1 °C | 7.8 °C | 77.47 mm |
| February | -3.2 °C | 9.6 °C | 69.6 mm |
| March | 0.4 °C | 14.2 °C | 93.22 mm |
| April | 6.1 °C | 20.7 °C | 86.36 mm |
| May | 11.3 °C | 24.6 °C | 103.38 mm |
| June | 16.3 °C | 28.9 °C | 110.24 mm |
| July | 18.7 °C | 31.2 °C | 106.68 mm |
| August | 17.8 °C | 30.2 °C | 94.49 mm |
| September | 14 °C | 26.8 °C | 114.55 mm |
| October | 7 °C | 21 °C | 95.76 mm |
| November | 1.2 °C | 14.9 °C | 89.92 mm |
| December | -2.3 °C | 9.6 °C | 86.61 mm |
| Annual | 6.9 °C | 20 °C | 1128.28 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |