Vernon, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.4 °C (low) to 23.4 °C (high). Annual precipitation averages 1517.7 Millimeters. Vernon 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 | 11.8 °C | 140.46 mm |
| February | 1.6 °C | 14.4 °C | 143.26 mm |
| March | 5.3 °C | 19.2 °C | 141.73 mm |
| April | 9.7 °C | 23.8 °C | 157.73 mm |
| May | 14.8 °C | 27.9 °C | 129.29 mm |
| June | 19.2 °C | 31.4 °C | 119.63 mm |
| July | 21.2 °C | 33 °C | 129.79 mm |
| August | 20.6 °C | 33.1 °C | 105.16 mm |
| September | 16.8 °C | 30.3 °C | 89.92 mm |
| October | 9.9 °C | 24.8 °C | 93.22 mm |
| November | 4.1 °C | 18.1 °C | 116.59 mm |
| December | 1.4 °C | 13.3 °C | 150.88 mm |
| Annual | 10.4 °C | 23.4 °C | 1517.66 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 |