Huntsville, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.9 °C (low) to 19.6 °C (high). Annual precipitation averages 1475.2 Millimeters. Huntsville is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.6 °C | 7.4 °C | 122.43 mm |
| February | -2.3 °C | 9.7 °C | 129.03 mm |
| March | 1.2 °C | 14.6 °C | 142.75 mm |
| April | 5.9 °C | 20.4 °C | 133.1 mm |
| May | 11.3 °C | 24.7 °C | 124.46 mm |
| June | 15.7 °C | 28.3 °C | 129.29 mm |
| July | 17.9 °C | 29.8 °C | 149.35 mm |
| August | 17.2 °C | 29.4 °C | 108.97 mm |
| September | 13.4 °C | 26.7 °C | 102.36 mm |
| October | 6.6 °C | 20.9 °C | 83.31 mm |
| November | 1 °C | 14.4 °C | 102.36 mm |
| December | -1.7 °C | 9.2 °C | 147.83 mm |
| Annual | 6.9 °C | 19.6 °C | 1475.24 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |