| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F | |
| 2012 Hardiness Zone: | Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F | |
| 1990 Hardiness Zone: | Zone 7b: 5F to 10F | |
| Average First Frost Date: | Nov. 11 - Nov. 20 | |
| Average Last Frost Date: | Mar. 21 - Mar. 31 | |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate | |
| Ecoregion: | 45c - Carolina Slate Belt | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 29063 - Irmo, SC | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 32 | 34 | 41 | 49 | 58 | 66 | 70 | 69 | 63 | 50 | 41 | 34 | 51 |
| Avg Max Temp (°F) | 55 | 60 | 67 | 76 | 83 | 89 | 92 | 90 | 85 | 76 | 66 | 58 | 75 |
| Avg Precip (In.) | 4.77 | 3.85 | 4.7 | 3.03 | 3.31 | 4.46 | 4.76 | 4.71 | 4.01 | 3.19 | 3.1 | 3.44 | 47.33 |