Greeneville, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.5 °C (low) to 20.3 °C (high). Annual precipitation averages 1155.5 Millimeters. Greeneville is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.2 °C | 8.6 °C | 93.47 mm |
| February | -1.6 °C | 10.9 °C | 94.49 mm |
| March | 1.9 °C | 15.5 °C | 103.63 mm |
| April | 6.4 °C | 20.9 °C | 105.16 mm |
| May | 11.4 °C | 25.2 °C | 106.17 mm |
| June | 16.3 °C | 28.4 °C | 110.24 mm |
| July | 18.3 °C | 30 °C | 127.25 mm |
| August | 17.6 °C | 29.7 °C | 94.23 mm |
| September | 14.2 °C | 27.1 °C | 75.44 mm |
| October | 7.2 °C | 21.8 °C | 63.25 mm |
| November | 1.9 °C | 15 °C | 76.96 mm |
| December | -0.9 °C | 10 °C | 105.16 mm |
| Annual | 7.5 °C | 20.3 °C | 1155.45 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |