Alston, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.8 °C (low) to 25.4 °C (high). Annual precipitation averages 1209.3 Millimeters. Alston is located in USDA Plant Hardiness Zone 9a. 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 | 3.2 °C | 15.9 °C | 109.47 mm |
| February | 4.8 °C | 17.9 °C | 101.09 mm |
| March | 7.9 °C | 21.6 °C | 108.97 mm |
| April | 11.8 °C | 25.6 °C | 83.82 mm |
| May | 16.6 °C | 29.6 °C | 74.42 mm |
| June | 20.7 °C | 32.4 °C | 125.73 mm |
| July | 22.2 °C | 33.6 °C | 122.68 mm |
| August | 22 °C | 33 °C | 148.34 mm |
| September | 19.3 °C | 30.6 °C | 96.52 mm |
| October | 13.3 °C | 26.2 °C | 70.36 mm |
| November | 7.4 °C | 21.1 °C | 68.33 mm |
| December | 4.6 °C | 17.2 °C | 99.57 mm |
| Annual | 12.8 °C | 25.4 °C | 1209.3 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 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |