Hardeeville, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.5 °C (low) to 25.2 °C (high). Annual precipitation averages 1328.9 Millimeters. Hardeeville is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.8 °C | 16.1 °C | 95 mm |
| February | 5.3 °C | 18 °C | 88.39 mm |
| March | 8.7 °C | 21.6 °C | 89.15 mm |
| April | 12.6 °C | 25.3 °C | 84.58 mm |
| May | 17.2 °C | 29 °C | 84.84 mm |
| June | 21.1 °C | 31.9 °C | 153.42 mm |
| July | 22.8 °C | 33.4 °C | 149.61 mm |
| August | 22.6 °C | 32.6 °C | 196.09 mm |
| September | 20.2 °C | 30 °C | 129.54 mm |
| October | 14.4 °C | 25.8 °C | 95.5 mm |
| November | 8.4 °C | 21 °C | 69.34 mm |
| December | 5.3 °C | 17.4 °C | 93.47 mm |
| Annual | 13.5 °C | 25.2 °C | 1328.93 mm |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |