Dayton, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.7 °C (low) to 21.3 °C (high). Annual precipitation averages 1527.8 Millimeters. Dayton is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.9 °C | 9.2 °C | 133.86 mm |
| February | -0.4 °C | 11.7 °C | 129.29 mm |
| March | 3.1 °C | 16.6 °C | 136.4 mm |
| April | 7.6 °C | 21.9 °C | 138.18 mm |
| May | 13.1 °C | 26.1 °C | 125.73 mm |
| June | 17.5 °C | 29.8 °C | 113.79 mm |
| July | 19.9 °C | 31.3 °C | 148.59 mm |
| August | 19.3 °C | 31.3 °C | 104.14 mm |
| September | 15.4 °C | 28.3 °C | 125.98 mm |
| October | 8.7 °C | 22.4 °C | 91.44 mm |
| November | 2.3 °C | 16 °C | 124.21 mm |
| December | -0.3 °C | 10.7 °C | 156.21 mm |
| Annual | 8.7 °C | 21.3 °C | 1527.82 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |