Jemison, Alabama 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 1435.9 Millimeters. Jemison 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 | 1.4 °C | 12.9 °C | 136.65 mm |
| February | 3 °C | 15.2 °C | 142.75 mm |
| March | 6.3 °C | 19.5 °C | 141.73 mm |
| April | 10.2 °C | 23.5 °C | 126.75 mm |
| May | 15.2 °C | 27.6 °C | 103.38 mm |
| June | 19.3 °C | 30.7 °C | 121.67 mm |
| July | 21 °C | 32.2 °C | 129.54 mm |
| August | 20.4 °C | 31.8 °C | 107.44 mm |
| September | 17.7 °C | 29.6 °C | 96.01 mm |
| October | 11.3 °C | 24.1 °C | 78.74 mm |
| November | 5.6 °C | 18.3 °C | 114.55 mm |
| December | 2.6 °C | 13.7 °C | 136.65 mm |
| Annual | 11.2 °C | 23.3 °C | 1435.86 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 8b : -9.4°C to -6.7°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 |