Hilton Head Island, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 58.5 °F (low) to 75.4 °F (high). Annual precipitation averages 54 Inches. Hilton Head Island is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 41.1 °F | 59.6 °F | 3.67 in. |
| February | 43.6 °F | 62.5 °F | 3.68 in. |
| March | 49.5 °F | 68.2 °F | 3.09 in. |
| April | 56.9 °F | 75.1 °F | 3.13 in. |
| May | 65.4 °F | 81.9 °F | 2.9 in. |
| June | 71.8 °F | 86.9 °F | 5.44 in. |
| July | 74.7 °F | 89.6 °F | 6.54 in. |
| August | 74.0 °F | 88.3 °F | 8.02 in. |
| September | 70.2 °F | 84.3 °F | 6.15 in. |
| October | 60.6 °F | 77.5 °F | 4.67 in. |
| November | 50.1 °F | 68.8 °F | 3.01 in. |
| December | 44.0 °F | 62.1 °F | 3.68 in. |
| Annual | 58.5 °F | 75.4 °F | 53.98 in. |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |