| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F |
| 1990 Hardiness Zone: | Zone 8b: 15F to 20F |
| Average First Frost Date: | Dec. 11 - Dec. 20 |
| Average Last Frost Date: | Mar. 1 - Mar. 10 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 75j - Sea Islands/Coastal Marsh |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 29928 - Hilton Head Island, SC | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 38 | 39 | 46 | 53 | 62 | 69 | 73 | 72 | 68 | 57 | 48 | 40 | 55 |
| Avg Max Temp (°F) | 59 | 61 | 68 | 74 | 81 | 86 | 89 | 87 | 83 | 76 | 69 | 61 | 74 |
| Avg Precip (In.) | 4.29 | 3.27 | 3.79 | 3.2 | 2.99 | 5.11 | 5.99 | 8.11 | 5.82 | 3.58 | 2.67 | 3.14 | 51.95 |