Startex, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.8 °C (low) to 22.3 °C (high). Annual precipitation averages 1321.6 Millimeters. Startex 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 | 11.6 °C | 112.01 mm |
| February | 1 °C | 13.8 °C | 101.85 mm |
| March | 4.6 °C | 17.9 °C | 122.43 mm |
| April | 8.9 °C | 22.8 °C | 110.24 mm |
| May | 13.8 °C | 26.8 °C | 99.57 mm |
| June | 18.3 °C | 30.3 °C | 111.25 mm |
| July | 20.4 °C | 32.3 °C | 111.51 mm |
| August | 19.8 °C | 31.2 °C | 125.73 mm |
| September | 16.6 °C | 28.3 °C | 105.41 mm |
| October | 9.8 °C | 22.9 °C | 97.28 mm |
| November | 3.9 °C | 17.3 °C | 102.11 mm |
| December | 1.1 °C | 12.8 °C | 122.17 mm |
| Annual | 9.8 °C | 22.3 °C | 1321.56 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 7b : -15°C to -12.2°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |