Harkers Island, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.3 °C (low) to 20.9 °C (high). Annual precipitation averages 1574 Millimeters. Harkers Island is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.9 °C | 12.1 °C | 115.82 mm |
| February | 4.8 °C | 12.8 °C | 105.16 mm |
| March | 8 °C | 15.8 °C | 97.54 mm |
| April | 12.9 °C | 19.7 °C | 103.38 mm |
| May | 17.8 °C | 23.7 °C | 111 mm |
| June | 22.2 °C | 27.3 °C | 113.79 mm |
| July | 24.2 °C | 29.1 °C | 157.23 mm |
| August | 23.7 °C | 28.7 °C | 200.15 mm |
| September | 21.4 °C | 26.9 °C | 211.58 mm |
| October | 15.9 °C | 22.6 °C | 127.25 mm |
| November | 10.1 °C | 17.8 °C | 119.13 mm |
| December | 6.3 °C | 14.1 °C | 112.01 mm |
| Annual | 14.3 °C | 20.9 °C | 1574.04 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°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 |