Walnut Grove, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.9 °C (low) to 21.6 °C (high). Annual precipitation averages 1492.5 Millimeters. Walnut Grove 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 | -2.9 °C | 7 °C | 106.17 mm |
| February | -1.2 °C | 9.6 °C | 116.33 mm |
| March | 3.1 °C | 14.6 °C | 125.22 mm |
| April | 8.2 °C | 20.3 °C | 130.81 mm |
| May | 13.8 °C | 24.8 °C | 148.08 mm |
| June | 18.2 °C | 29.1 °C | 114.05 mm |
| July | 19.9 °C | 30.8 °C | 119.89 mm |
| August | 19.1 °C | 30.8 °C | 96.01 mm |
| September | 15.2 °C | 27.6 °C | 99.82 mm |
| October | 8.9 °C | 21.4 °C | 97.03 mm |
| November | 3.2 °C | 14.4 °C | 99.82 mm |
| December | -0.4 °C | 9 °C | 128.78 mm |
| Annual | 8.8 °C | 20 °C | 1382.01 mm |
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.8 °C | 9.6 °C | 129.79 mm |
| February | -0.1 °C | 12.3 °C | 133.86 mm |
| March | 3.6 °C | 17 °C | 140.46 mm |
| April | 8.4 °C | 22.3 °C | 139.95 mm |
| May | 13.3 °C | 26.2 °C | 133.86 mm |
| June | 17.8 °C | 29.8 °C | 116.08 mm |
| July | 19.9 °C | 31.6 °C | 127.25 mm |
| August | 19.1 °C | 31.2 °C | 111.51 mm |
| September | 15.6 °C | 28.6 °C | 107.19 mm |
| October | 8.6 °C | 22.9 °C | 97.79 mm |
| November | 2.9 °C | 16.3 °C | 104.65 mm |
| December | -0.2 °C | 11.3 °C | 150.11 mm |
| Annual | 8.9 °C | 21.6 °C | 1492.5 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 7a : -17.8°C to -15°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 |
| 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 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |