McEwen, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 48.2 °F (low) to 68.5 °F (high). Annual precipitation averages 55.5 Inches. 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 | 28.1 °F | 46.6 °F | 4.54 in. |
| February | 30.8 °F | 50.8 °F | 4.63 in. |
| March | 39.0 °F | 60.1 °F | 5.29 in. |
| April | 47.3 °F | 69.8 °F | 5.23 in. |
| May | 56.6 °F | 77.1 °F | 5.71 in. |
| June | 64.2 °F | 83.7 °F | 4.53 in. |
| July | 67.2 °F | 86.8 °F | 4.57 in. |
| August | 66.3 °F | 86.8 °F | 3.95 in. |
| September | 59.6 °F | 81.0 °F | 3.91 in. |
| October | 48.7 °F | 70.8 °F | 3.87 in. |
| November | 39.0 °F | 59.1 °F | 4.01 in. |
| December | 31.6 °F | 49.0 °F | 5.24 in. |
| Annual | 48.2 °F | 68.5 °F | 55.48 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |