Smyrna, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.6 °F (low) to 70 °F (high). Annual precipitation averages 53.7 Inches. Smyrna 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 | 27.8 °F | 47.4 °F | 4.42 in. |
| February | 30.4 °F | 51.7 °F | 4.74 in. |
| March | 37.1 °F | 60.6 °F | 5.12 in. |
| April | 46.2 °F | 70.8 °F | 4.84 in. |
| May | 56.1 °F | 78.9 °F | 4.78 in. |
| June | 64.3 °F | 86.1 °F | 4.85 in. |
| July | 68.7 °F | 89.2 °F | 4.56 in. |
| August | 67.0 °F | 89.0 °F | 3.71 in. |
| September | 59.6 °F | 83.2 °F | 3.97 in. |
| October | 47.0 °F | 72.4 °F | 3.49 in. |
| November | 36.4 °F | 60.2 °F | 3.86 in. |
| December | 30.8 °F | 50.7 °F | 5.31 in. |
| Annual | 47.6 °F | 70 °F | 53.65 in. |
| 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 : 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 |