Ulmer, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 53.5 °F (low) to 76.4 °F (high). Annual precipitation averages 48.6 Inches. Ulmer is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.8 °F | 59.0 °F | 3.96 in. |
| February | 38.2 °F | 62.5 °F | 3.67 in. |
| March | 44.1 °F | 69.5 °F | 3.93 in. |
| April | 51.7 °F | 77.2 °F | 3.08 in. |
| May | 60.4 °F | 84.0 °F | 3.4 in. |
| June | 68.0 °F | 89.4 °F | 5.44 in. |
| July | 71.5 °F | 92.2 °F | 5.47 in. |
| August | 70.7 °F | 90.2 °F | 5.65 in. |
| September | 65.5 °F | 85.7 °F | 4.24 in. |
| October | 54.1 °F | 77.8 °F | 3.17 in. |
| November | 43.4 °F | 68.3 °F | 2.84 in. |
| December | 38.0 °F | 61.1 °F | 3.77 in. |
| Annual | 53.5 °F | 76.4 °F | 48.62 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |