Dayton, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.8 °C (low) to 24.2 °C (high). Annual precipitation averages 1400.6 Millimeters. Dayton 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 | 1.7 °C | 13.5 °C | 132.59 mm |
| February | 3.6 °C | 15.9 °C | 135.64 mm |
| March | 6.9 °C | 20.5 °C | 144.27 mm |
| April | 10.9 °C | 24.3 °C | 116.84 mm |
| May | 15.8 °C | 28.5 °C | 99.57 mm |
| June | 20.2 °C | 31.8 °C | 113.28 mm |
| July | 21.8 °C | 33.1 °C | 131.57 mm |
| August | 21.2 °C | 32.8 °C | 115.82 mm |
| September | 18.2 °C | 30.7 °C | 95.25 mm |
| October | 11.9 °C | 25.4 °C | 82.04 mm |
| November | 5.9 °C | 19.3 °C | 108.2 mm |
| December | 3.1 °C | 14.8 °C | 125.48 mm |
| Annual | 11.8 °C | 24.2 °C | 1400.55 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 |