Westminster, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.1 °F (low) to 72.4 °F (high). Annual precipitation averages 56.3 Inches. Westminster is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 31.8 °F | 53.0 °F | 5.1 in. |
| February | 34.4 °F | 56.9 °F | 4.71 in. |
| March | 40.5 °F | 64.3 °F | 5.03 in. |
| April | 48.3 °F | 73.5 °F | 4.31 in. |
| May | 57.2 °F | 80.2 °F | 4.1 in. |
| June | 65.2 °F | 86.6 °F | 4.85 in. |
| July | 68.6 °F | 89.8 °F | 4.51 in. |
| August | 67.9 °F | 88.3 °F | 5.61 in. |
| September | 62.3 °F | 83.2 °F | 4.24 in. |
| October | 50.3 °F | 73.5 °F | 4.23 in. |
| November | 39.8 °F | 63.6 °F | 4.23 in. |
| December | 34.5 °F | 55.4 °F | 5.35 in. |
| Annual | 50.1 °F | 72.4 °F | 56.27 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |