Oak Grove, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.6 °C (low) to 24.1 °C (high). Annual precipitation averages 1245.4 Millimeters. Oak Grove is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.4 °C | 13.7 °C | 101.6 mm |
| February | 2.8 °C | 15.7 °C | 95.76 mm |
| March | 6.4 °C | 19.8 °C | 109.73 mm |
| April | 10.9 °C | 24.6 °C | 80.52 mm |
| May | 15.8 °C | 28.5 °C | 85.6 mm |
| June | 20.2 °C | 31.8 °C | 128.02 mm |
| July | 22 °C | 33.6 °C | 121.41 mm |
| August | 21.6 °C | 32.6 °C | 125.48 mm |
| September | 18.4 °C | 29.9 °C | 106.93 mm |
| October | 11.8 °C | 24.7 °C | 97.54 mm |
| November | 5.7 °C | 19.1 °C | 89.66 mm |
| December | 2.7 °C | 14.9 °C | 103.12 mm |
| Annual | 11.6 °C | 24.1 °C | 1245.37 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |