Lamar, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.9 °F (low) to 74.6 °F (high). Annual precipitation averages 47.5 Inches. Lamar 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 33.6 °F | 56.1 °F | 3.65 in. |
| February | 35.7 °F | 59.6 °F | 3.43 in. |
| March | 41.8 °F | 66.9 °F | 3.59 in. |
| April | 50.3 °F | 75.9 °F | 3.17 in. |
| May | 59.3 °F | 82.7 °F | 3.63 in. |
| June | 67.5 °F | 88.6 °F | 4.72 in. |
| July | 70.7 °F | 91.1 °F | 5.1 in. |
| August | 69.5 °F | 89.5 °F | 5.31 in. |
| September | 63.7 °F | 84.8 °F | 4.71 in. |
| October | 52.3 °F | 75.8 °F | 3.49 in. |
| November | 41.6 °F | 66.2 °F | 2.95 in. |
| December | 36.5 °F | 58.5 °F | 3.77 in. |
| Annual | 51.9 °F | 74.6 °F | 47.52 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 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 |