Castle Hayne, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52 °F (low) to 74.1 °F (high). Annual precipitation averages 60.6 Inches. Castle Hayne is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 33.6 °F | 56.8 °F | 3.85 in. |
| February | 35.4 °F | 59.5 °F | 3.53 in. |
| March | 41.3 °F | 66.1 °F | 3.95 in. |
| April | 50.3 °F | 74.2 °F | 3.41 in. |
| May | 59.1 °F | 81.0 °F | 4.32 in. |
| June | 67.4 °F | 86.9 °F | 5.67 in. |
| July | 71.2 °F | 90.0 °F | 6.86 in. |
| August | 69.8 °F | 88.4 °F | 7.72 in. |
| September | 64.6 °F | 83.9 °F | 9.26 in. |
| October | 52.9 °F | 75.8 °F | 4.72 in. |
| November | 42.3 °F | 66.9 °F | 3.54 in. |
| December | 36.6 °F | 59.7 °F | 3.78 in. |
| Annual | 52 °F | 74.1 °F | 60.61 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |