Blythewood, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.1 °C (low) to 23.4 °C (high). Annual precipitation averages 1157 Millimeters. Blythewood 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 | 1 °C | 12.8 °C | 98.81 mm |
| February | 2.2 °C | 14.8 °C | 87.88 mm |
| March | 5.8 °C | 19.1 °C | 101.85 mm |
| April | 10.3 °C | 24 °C | 77.22 mm |
| May | 15.2 °C | 27.8 °C | 80.01 mm |
| June | 19.6 °C | 31.6 °C | 109.98 mm |
| July | 21.4 °C | 33.3 °C | 102.87 mm |
| August | 21 °C | 32.3 °C | 123.95 mm |
| September | 17.8 °C | 29.3 °C | 103.89 mm |
| October | 11.3 °C | 23.8 °C | 88.65 mm |
| November | 5.7 °C | 18.3 °C | 80.01 mm |
| December | 2.4 °C | 14.1 °C | 101.85 mm |
| Annual | 11.1 °C | 23.4 °C | 1156.97 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 8a : -12.2°C to -9.4°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 |