West Jefferson, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.2 °C (low) to 23.6 °C (high). Annual precipitation averages 1489.2 Millimeters. West Jefferson is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.2 °C | 12.5 °C | 142.75 mm |
| February | 1.3 °C | 14.8 °C | 136.65 mm |
| March | 5.2 °C | 19.6 °C | 151.13 mm |
| April | 9.1 °C | 24.2 °C | 133.1 mm |
| May | 14.3 °C | 27.9 °C | 116.84 mm |
| June | 18.7 °C | 31.3 °C | 124.46 mm |
| July | 20.6 °C | 33 °C | 128.02 mm |
| August | 20.2 °C | 32.8 °C | 101.09 mm |
| September | 16.8 °C | 30.2 °C | 114.05 mm |
| October | 10 °C | 24.7 °C | 88.14 mm |
| November | 4.3 °C | 18.6 °C | 117.09 mm |
| December | 1.6 °C | 13.8 °C | 135.89 mm |
| Annual | 10.2 °C | 23.6 °C | 1489.21 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |