Belhaven, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.3 °C (low) to 22.3 °C (high). Annual precipitation averages 1333 Millimeters. Belhaven is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.9 °C | 12 °C | 94.74 mm |
| February | 1.9 °C | 13.8 °C | 79.5 mm |
| March | 5.2 °C | 17.2 °C | 98.04 mm |
| April | 10.3 °C | 22.3 °C | 85.6 mm |
| May | 15.3 °C | 26.1 °C | 102.87 mm |
| June | 19.7 °C | 29.8 °C | 135.13 mm |
| July | 22 °C | 31.6 °C | 152.65 mm |
| August | 21.2 °C | 30.8 °C | 162.81 mm |
| September | 18.4 °C | 28.1 °C | 155.7 mm |
| October | 12.2 °C | 23.3 °C | 90.68 mm |
| November | 6.3 °C | 18.1 °C | 87.88 mm |
| December | 2.7 °C | 13.9 °C | 87.38 mm |
| Annual | 11.3 °C | 22.3 °C | 1332.98 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |