Thorsby, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11 °C (low) to 23.3 °C (high). Annual precipitation averages 1429 Millimeters. Thorsby is located in USDA Plant Hardiness Zone 8a. 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 | 1.2 °C | 12.8 °C | 136.4 mm |
| February | 2.8 °C | 15.2 °C | 141.22 mm |
| March | 6.2 °C | 19.6 °C | 142.75 mm |
| April | 10 °C | 23.5 °C | 124.46 mm |
| May | 14.9 °C | 27.6 °C | 102.36 mm |
| June | 19.2 °C | 30.8 °C | 122.43 mm |
| July | 20.9 °C | 32.2 °C | 131.83 mm |
| August | 20.5 °C | 31.9 °C | 106.93 mm |
| September | 17.6 °C | 29.6 °C | 93.73 mm |
| October | 11.2 °C | 24.1 °C | 76.71 mm |
| November | 5.4 °C | 18.3 °C | 114.05 mm |
| December | 2.5 °C | 13.8 °C | 136.14 mm |
| Annual | 11 °C | 23.3 °C | 1429.01 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |