Oak Island, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.4 °C (low) to 22.3 °C (high). Annual precipitation averages 1473.5 Millimeters. Oak Island 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 Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.1 °C | 12.9 °C | 98.3 mm |
| February | 4.1 °C | 14.2 °C | 89.41 mm |
| March | 7.4 °C | 17.7 °C | 99.57 mm |
| April | 12.5 °C | 22.2 °C | 87.63 mm |
| May | 17.3 °C | 25.8 °C | 101.85 mm |
| June | 21.7 °C | 29.2 °C | 128.52 mm |
| July | 23.6 °C | 29.9 °C | 169.67 mm |
| August | 22.9 °C | 30.5 °C | 178.82 mm |
| September | 20.2 °C | 27.7 °C | 211.58 mm |
| October | 14.4 °C | 23.6 °C | 121.67 mm |
| November | 8.4 °C | 18.7 °C | 90.93 mm |
| December | 5.1 °C | 14.8 °C | 95.5 mm |
| Annual | 13.4 °C | 22.3 °C | 1473.45 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |