Lewisport, Kentucky has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.2 °C (low) to 19.7 °C (high). Annual precipitation averages 1263.4 Millimeters. Lewisport is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.6 °C | 5.8 °C | 91.44 mm |
| February | -2.4 °C | 8.3 °C | 91.69 mm |
| March | 1.9 °C | 13.6 °C | 115.57 mm |
| April | 7.4 °C | 20.1 °C | 127.25 mm |
| May | 13.4 °C | 25.3 °C | 135.64 mm |
| June | 18.1 °C | 29.7 °C | 120.4 mm |
| July | 20 °C | 31.2 °C | 106.93 mm |
| August | 18.9 °C | 31 °C | 77.98 mm |
| September | 14.8 °C | 27.9 °C | 92.71 mm |
| October | 8.3 °C | 21.6 °C | 94.74 mm |
| November | 2.6 °C | 13.9 °C | 99.82 mm |
| December | -1.3 °C | 8.1 °C | 109.22 mm |
| Annual | 8.2 °C | 19.7 °C | 1263.39 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| 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 |