Blenheim, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.4 °F (low) to 74 °F (high). Annual precipitation averages 47.8 Inches. Blenheim 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 | 32.8 °F | 55.0 °F | 3.58 in. |
| February | 34.9 °F | 58.6 °F | 3.3 in. |
| March | 41.0 °F | 66.2 °F | 3.59 in. |
| April | 49.4 °F | 75.2 °F | 3.27 in. |
| May | 58.7 °F | 82.2 °F | 3.62 in. |
| June | 67.6 °F | 88.3 °F | 4.73 in. |
| July | 71.2 °F | 91.0 °F | 4.99 in. |
| August | 69.4 °F | 89.2 °F | 5.26 in. |
| September | 63.5 °F | 83.9 °F | 5.21 in. |
| October | 51.5 °F | 75.4 °F | 3.4 in. |
| November | 40.6 °F | 65.5 °F | 3.2 in. |
| December | 35.6 °F | 57.8 °F | 3.67 in. |
| Annual | 51.4 °F | 74 °F | 47.82 in. |
| 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 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |