Estill Springs, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.9 °C (low) to 20.9 °C (high). Annual precipitation averages 1462.3 Millimeters. Estill Springs 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 | -1.6 °C | 9.1 °C | 127.25 mm |
| February | -0.2 °C | 11.4 °C | 128.02 mm |
| March | 3.4 °C | 16.2 °C | 135.89 mm |
| April | 8.2 °C | 21.3 °C | 137.16 mm |
| May | 13.3 °C | 25.5 °C | 115.82 mm |
| June | 17.7 °C | 29.2 °C | 134.87 mm |
| July | 19.7 °C | 30.9 °C | 120.4 mm |
| August | 18.9 °C | 30.7 °C | 101.85 mm |
| September | 15.3 °C | 27.8 °C | 111.76 mm |
| October | 8.6 °C | 22.3 °C | 86.87 mm |
| November | 2.8 °C | 15.8 °C | 106.43 mm |
| December | 0.1 °C | 10.8 °C | 155.96 mm |
| Annual | 8.9 °C | 20.9 °C | 1462.28 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |