McCormick, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.4 °C (low) to 23.4 °C (high). Annual precipitation averages 1178.1 Millimeters. McCormick is located in USDA Plant Hardiness Zone 8a. 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 | 0.3 °C | 12.8 °C | 103.63 mm |
| February | 1.4 °C | 14.7 °C | 98.55 mm |
| March | 4.9 °C | 19.1 °C | 114.55 mm |
| April | 9.4 °C | 23.8 °C | 81.03 mm |
| May | 14.4 °C | 27.8 °C | 82.55 mm |
| June | 18.9 °C | 31.3 °C | 115.32 mm |
| July | 20.9 °C | 33.1 °C | 103.38 mm |
| August | 20.3 °C | 32.4 °C | 110.24 mm |
| September | 17.1 °C | 29.5 °C | 93.22 mm |
| October | 10.5 °C | 24.3 °C | 77.22 mm |
| November | 4.4 °C | 18.4 °C | 89.15 mm |
| December | 1.7 °C | 13.9 °C | 109.22 mm |
| Annual | 10.4 °C | 23.4 °C | 1178.06 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |