Aynor, South Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.2 °C (low) to 23.3 °C (high). Annual precipitation averages 1328.2 Millimeters. Aynor is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.2 °C | 13.5 °C | 91.44 mm |
| February | 2.4 °C | 15.3 °C | 87.12 mm |
| March | 5.5 °C | 19.2 °C | 93.73 mm |
| April | 10.2 °C | 23.9 °C | 86.61 mm |
| May | 15.1 °C | 27.6 °C | 100.33 mm |
| June | 19.7 °C | 30.7 °C | 131.32 mm |
| July | 21.7 °C | 31.7 °C | 142.75 mm |
| August | 21.1 °C | 31.7 °C | 162.05 mm |
| September | 17.9 °C | 27.8 °C | 159.51 mm |
| October | 11.5 °C | 24.2 °C | 96.27 mm |
| November | 5.6 °C | 19 °C | 82.8 mm |
| December | 2.7 °C | 14.9 °C | 94.23 mm |
| Annual | 11.2 °C | 23.3 °C | 1328.16 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |