Lyman, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.4 °F (low) to 71.7 °F (high). Annual precipitation averages 52.6 Inches. Lyman 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 | 32.0 °F | 52.2 °F | 4.44 in. |
| February | 34.4 °F | 56.2 °F | 3.99 in. |
| March | 41.1 °F | 63.7 °F | 4.75 in. |
| April | 48.9 °F | 72.5 °F | 4.4 in. |
| May | 57.7 °F | 79.6 °F | 4.04 in. |
| June | 65.6 °F | 86.1 °F | 4.55 in. |
| July | 69.2 °F | 89.7 °F | 4.56 in. |
| August | 68.1 °F | 87.7 °F | 4.95 in. |
| September | 62.4 °F | 82.4 °F | 4.15 in. |
| October | 50.7 °F | 72.7 °F | 3.89 in. |
| November | 40.0 °F | 62.5 °F | 4.07 in. |
| December | 34.7 °F | 54.5 °F | 4.79 in. |
| Annual | 50.4 °F | 71.7 °F | 52.58 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 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |