Allendale, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 53.4 °F (low) to 76.5 °F (high). Annual precipitation averages 47.9 Inches. Allendale 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. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.7 °F | 59.1 °F | 4.09 in. |
| February | 38.1 °F | 62.6 °F | 3.63 in. |
| March | 44.0 °F | 69.9 °F | 3.93 in. |
| April | 51.6 °F | 77.2 °F | 2.98 in. |
| May | 60.4 °F | 84.0 °F | 3.24 in. |
| June | 67.9 °F | 89.4 °F | 5.2 in. |
| July | 71.3 °F | 92.2 °F | 5.52 in. |
| August | 70.7 °F | 90.1 °F | 5.59 in. |
| September | 65.5 °F | 85.6 °F | 4.02 in. |
| October | 54.2 °F | 77.9 °F | 3.1 in. |
| November | 43.4 °F | 68.4 °F | 2.86 in. |
| December | 38.0 °F | 61.1 °F | 3.78 in. |
| Annual | 53.4 °F | 76.5 °F | 47.94 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |