Westport, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.4 °C (low) to 21.8 °C (high). Annual precipitation averages 1152.9 Millimeters. Westport is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.2 °C | 10.7 °C | 93.47 mm |
| February | 0.2 °C | 12.9 °C | 79.25 mm |
| March | 3.8 °C | 17.2 °C | 104.39 mm |
| April | 8.7 °C | 22.2 °C | 98.3 mm |
| May | 13.8 °C | 26.1 °C | 93.98 mm |
| June | 18.4 °C | 30.1 °C | 104.39 mm |
| July | 20.4 °C | 31.8 °C | 103.63 mm |
| August | 19.6 °C | 30.9 °C | 111.76 mm |
| September | 16.3 °C | 27.9 °C | 103.12 mm |
| October | 9.3 °C | 22.7 °C | 83.31 mm |
| November | 3.3 °C | 16.8 °C | 82.8 mm |
| December | 0.2 °C | 12.2 °C | 94.49 mm |
| Annual | 9.4 °C | 21.8 °C | 1152.89 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |