Webb, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.1 °C (low) to 25.4 °C (high). Annual precipitation averages 1441.7 Millimeters. Webb is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.5 °C | 15.8 °C | 125.22 mm |
| February | 5.2 °C | 17.8 °C | 139.7 mm |
| March | 8.3 °C | 21.8 °C | 129.03 mm |
| April | 12.2 °C | 25.7 °C | 120.65 mm |
| May | 17.1 °C | 29.9 °C | 88.39 mm |
| June | 21.1 °C | 32.3 °C | 135.89 mm |
| July | 22.3 °C | 33.3 °C | 155.96 mm |
| August | 21.9 °C | 32.8 °C | 134.37 mm |
| September | 19.4 °C | 30.8 °C | 110.74 mm |
| October | 13.6 °C | 26.4 °C | 73.41 mm |
| November | 7.7 °C | 20.9 °C | 99.31 mm |
| December | 5.1 °C | 16.9 °C | 129.03 mm |
| Annual | 13.1 °C | 25.4 °C | 1441.7 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |