Walterhill, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.6 °C (low) to 21.2 °C (high). Annual precipitation averages 1389.6 Millimeters. Walterhill 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 | -2.4 °C | 8.6 °C | 115.82 mm |
| February | -1 °C | 11 °C | 121.92 mm |
| March | 2.7 °C | 15.9 °C | 132.33 mm |
| April | 7.8 °C | 21.5 °C | 123.19 mm |
| May | 13.4 °C | 26.1 °C | 128.52 mm |
| June | 17.8 °C | 30.1 °C | 129.03 mm |
| July | 20.3 °C | 31.8 °C | 121.16 mm |
| August | 19.3 °C | 31.7 °C | 92.46 mm |
| September | 15.2 °C | 28.5 °C | 100.33 mm |
| October | 8.2 °C | 22.6 °C | 87.88 mm |
| November | 2.3 °C | 15.7 °C | 96.77 mm |
| December | -0.7 °C | 10.3 °C | 140.21 mm |
| Annual | 8.6 °C | 21.2 °C | 1389.62 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |