Three Way, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.4 °C (low) to 21.4 °C (high). Annual precipitation averages 1432.1 Millimeters. Three Way 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 | -1.9 °C | 8.7 °C | 108.2 mm |
| February | -0.2 °C | 11.3 °C | 123.44 mm |
| March | 3.9 °C | 16.3 °C | 141.22 mm |
| April | 8.9 °C | 22.1 °C | 134.62 mm |
| May | 14.4 °C | 26.4 °C | 147.07 mm |
| June | 18.9 °C | 30.4 °C | 116.59 mm |
| July | 20.8 °C | 32.1 °C | 112.52 mm |
| August | 19.7 °C | 31.9 °C | 97.54 mm |
| September | 15.7 °C | 28.8 °C | 103.89 mm |
| October | 8.9 °C | 22.9 °C | 100.33 mm |
| November | 3.4 °C | 15.9 °C | 112.52 mm |
| December | -0.2 °C | 10.3 °C | 134.11 mm |
| Annual | 9.4 °C | 21.4 °C | 1432.05 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |