Decaturville, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.8 °C (low) to 21.4 °C (high). Annual precipitation averages 1436.4 Millimeters. Decaturville 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 | -2.2 °C | 9.1 °C | 119.89 mm |
| February | -0.3 °C | 11.9 °C | 125.73 mm |
| March | 3.4 °C | 16.9 °C | 132.08 mm |
| April | 8.1 °C | 22.2 °C | 143.26 mm |
| May | 13.7 °C | 25.9 °C | 140.72 mm |
| June | 18.2 °C | 29.8 °C | 116.33 mm |
| July | 20.2 °C | 31.4 °C | 117.86 mm |
| August | 19.2 °C | 31.3 °C | 93.98 mm |
| September | 15.3 °C | 28.4 °C | 103.89 mm |
| October | 8.3 °C | 22.9 °C | 99.06 mm |
| November | 2.7 °C | 16.3 °C | 105.41 mm |
| December | -0.5 °C | 10.7 °C | 138.18 mm |
| Annual | 8.8 °C | 21.4 °C | 1436.39 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |