| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F | |
| 2012 Hardiness Zone: | Zone 9a: 20°F to 25°F | |
| 1990 Hardiness Zone: | Zone 8b: 15F to 20F | |
| Average First Frost Date: | Jan. 11 - Jan. 20 | |
| Average Last Frost Date: | Jan. 21 - Jan. 31 | |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate | |
| Ecoregion: | 75j - Sea Islands/Coastal Marsh | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 29403 - Charleston, SC | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 40 | 42 | 48 | 56 | 65 | 71 | 75 | 74 | 70 | 59 | 50 | 43 | 58 |
| Avg Max Temp (°F) | 57 | 60 | 67 | 74 | 81 | 86 | 89 | 88 | 84 | 76 | 68 | 60 | 74 |
| Avg Precip (In.) | 3.7 | 2.68 | 4.04 | 2.5 | 2.96 | 5.2 | 5.56 | 6.57 | 5.95 | 3.11 | 2.27 | 2.83 | 47.37 |