Beaufort, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.4 °C (low) to 24.5 °C (high). Annual precipitation averages 1294.1 Millimeters. Beaufort 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 | 4.6 °C | 15.3 °C | 95.5 mm |
| February | 6.1 °C | 17 °C | 85.85 mm |
| March | 9.4 °C | 20.6 °C | 77.72 mm |
| April | 13.7 °C | 24.5 °C | 80.52 mm |
| May | 18.2 °C | 28.3 °C | 68.83 mm |
| June | 22 °C | 31.1 °C | 148.08 mm |
| July | 23.7 °C | 32.7 °C | 157.48 mm |
| August | 23.3 °C | 31.8 °C | 172.47 mm |
| September | 20.9 °C | 29.6 °C | 138.43 mm |
| October | 15.4 °C | 25.4 °C | 104.39 mm |
| November | 9.4 °C | 20.3 °C | 77.22 mm |
| December | 6.4 °C | 16.8 °C | 87.63 mm |
| Annual | 14.4 °C | 24.5 °C | 1294.12 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |