Greenfield, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9 °C (low) to 20.6 °C (high). Annual precipitation averages 1377.2 Millimeters. Greenfield 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 | -2.4 °C | 7.9 °C | 104.14 mm |
| February | -0.8 °C | 10.4 °C | 114.3 mm |
| March | 3.6 °C | 15.6 °C | 131.32 mm |
| April | 8.9 °C | 21.3 °C | 132.59 mm |
| May | 14.1 °C | 25.5 °C | 145.8 mm |
| June | 18.6 °C | 29.5 °C | 115.57 mm |
| July | 20.4 °C | 31.2 °C | 106.93 mm |
| August | 19.4 °C | 31.1 °C | 85.09 mm |
| September | 15.3 °C | 27.8 °C | 96.01 mm |
| October | 8.7 °C | 21.9 °C | 97.54 mm |
| November | 3.3 °C | 15.3 °C | 115.82 mm |
| December | -0.6 °C | 9.5 °C | 132.08 mm |
| Annual | 9 °C | 20.6 °C | 1377.19 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |