Manns Harbor, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.6 °C (low) to 21.2 °C (high). Annual precipitation averages 1275.1 Millimeters. Manns Harbor is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.2 °C | 11.2 °C | 105.16 mm |
| February | 2.7 °C | 12.2 °C | 79.5 mm |
| March | 5.6 °C | 15.7 °C | 89.15 mm |
| April | 10.8 °C | 20.3 °C | 75.95 mm |
| May | 15.8 °C | 24.5 °C | 92.2 mm |
| June | 20.5 °C | 28.7 °C | 118.62 mm |
| July | 22.8 °C | 30.8 °C | 133.35 mm |
| August | 22.2 °C | 29.9 °C | 153.16 mm |
| September | 20.1 °C | 27.3 °C | 135.38 mm |
| October | 14.6 °C | 22.7 °C | 104.65 mm |
| November | 8.7 °C | 17.4 °C | 88.14 mm |
| December | 4.7 °C | 13.3 °C | 99.82 mm |
| Annual | 12.6 °C | 21.2 °C | 1275.08 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |