Shackle Island, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.8 °C (low) to 20.7 °C (high). Annual precipitation averages 1355.6 Millimeters. Shackle Island 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.4 °C | 7.9 °C | 106.17 mm |
| February | -1 °C | 10.5 °C | 114.55 mm |
| March | 3.1 °C | 15.5 °C | 124.46 mm |
| April | 7.8 °C | 21.2 °C | 128.78 mm |
| May | 13.2 °C | 25.6 °C | 140.97 mm |
| June | 18.2 °C | 29.7 °C | 113.03 mm |
| July | 20.2 °C | 31.7 °C | 118.87 mm |
| August | 19.4 °C | 31.4 °C | 96.77 mm |
| September | 15.5 °C | 28.3 °C | 99.31 mm |
| October | 8.7 °C | 22.1 °C | 91.44 mm |
| November | 2.7 °C | 15.2 °C | 95.25 mm |
| December | -0.4 °C | 9.8 °C | 125.98 mm |
| Annual | 8.8 °C | 20.7 °C | 1355.58 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 7a : -17.8°C to -15°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |