Westport, Kentucky has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 8 °C (low) to 19.3 °C (high). Annual precipitation averages 1267.5 Millimeters. Westport 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 | 5.4 °C | 92.46 mm |
| February | -2.4 °C | 7.9 °C | 89.66 mm |
| March | 1.7 °C | 13.4 °C | 114.3 mm |
| April | 7.2 °C | 19.8 °C | 125.98 mm |
| May | 12.9 °C | 24.7 °C | 135.64 mm |
| June | 17.7 °C | 29.2 °C | 126.49 mm |
| July | 19.7 °C | 30.9 °C | 111.51 mm |
| August | 18.8 °C | 30.4 °C | 91.19 mm |
| September | 14.6 °C | 27.3 °C | 88.39 mm |
| October | 8.2 °C | 21.2 °C | 92.2 mm |
| November | 2.4 °C | 13.6 °C | 92.46 mm |
| December | -1.4 °C | 7.7 °C | 107.19 mm |
| Annual | 8 °C | 19.3 °C | 1267.47 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |