Valley, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.1 °C (low) to 23.8 °C (high). Annual precipitation averages 1355.4 Millimeters. Valley is located in USDA Plant Hardiness Zone 8b. 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 | 0.9 °C | 13.6 °C | 128.78 mm |
| February | 2.6 °C | 15.8 °C | 124.21 mm |
| March | 6 °C | 20.1 °C | 133.1 mm |
| April | 9.8 °C | 23.9 °C | 119.63 mm |
| May | 15 °C | 27.9 °C | 94.74 mm |
| June | 19.3 °C | 31.1 °C | 104.14 mm |
| July | 21.2 °C | 32.6 °C | 135.64 mm |
| August | 20.9 °C | 32.1 °C | 100.84 mm |
| September | 17.9 °C | 29.6 °C | 91.69 mm |
| October | 11.3 °C | 24.6 °C | 83.57 mm |
| November | 5.5 °C | 19.1 °C | 99.82 mm |
| December | 2.4 °C | 14.8 °C | 139.19 mm |
| Annual | 11.1 °C | 23.8 °C | 1355.35 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| 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 |