McEwen, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9 °C (low) to 20.3 °C (high). Annual precipitation averages 1409.2 Millimeters. McEwen is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.2 °C | 8.1 °C | 115.32 mm |
| February | -0.7 °C | 10.4 °C | 117.6 mm |
| March | 3.9 °C | 15.6 °C | 134.37 mm |
| April | 8.5 °C | 21 °C | 132.84 mm |
| May | 13.7 °C | 25.1 °C | 145.03 mm |
| June | 17.9 °C | 28.7 °C | 115.06 mm |
| July | 19.6 °C | 30.4 °C | 116.08 mm |
| August | 19.1 °C | 30.4 °C | 100.33 mm |
| September | 15.3 °C | 27.2 °C | 99.31 mm |
| October | 9.3 °C | 21.6 °C | 98.3 mm |
| November | 3.9 °C | 15.1 °C | 101.85 mm |
| December | -0.2 °C | 9.4 °C | 133.1 mm |
| Annual | 9 °C | 20.3 °C | 1409.19 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |