Grover, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.3 °C (low) to 24.5 °C (high). Annual precipitation averages 1288 Millimeters. Grover is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.4 °C | 15.1 °C | 88.39 mm |
| February | 3.8 °C | 16.9 °C | 97.28 mm |
| March | 7.2 °C | 20.7 °C | 95 mm |
| April | 11.3 °C | 24.8 °C | 89.92 mm |
| May | 16.1 °C | 28.4 °C | 90.93 mm |
| June | 20.3 °C | 31.4 °C | 141.48 mm |
| July | 22.1 °C | 33.1 °C | 147.57 mm |
| August | 21.7 °C | 32.1 °C | 149.86 mm |
| September | 19.1 °C | 29.6 °C | 128.27 mm |
| October | 12.8 °C | 25.1 °C | 94.74 mm |
| November | 6.8 °C | 20.2 °C | 69.6 mm |
| December | 3.8 °C | 16.4 °C | 95 mm |
| Annual | 12.3 °C | 24.5 °C | 1288.04 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |