Seymour, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.7 °F (low) to 68.7 °F (high). Annual precipitation averages 51.1 Inches. Seymour 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 | 27.7 °F | 47.1 °F | 4.87 in. |
| February | 30.6 °F | 51.5 °F | 4.48 in. |
| March | 36.8 °F | 60.4 °F | 4.91 in. |
| April | 44.9 °F | 69.8 °F | 4.53 in. |
| May | 54.4 °F | 77.3 °F | 4.14 in. |
| June | 62.2 °F | 83.8 °F | 4.16 in. |
| July | 66.1 °F | 86.6 °F | 5.18 in. |
| August | 64.9 °F | 86.2 °F | 3.14 in. |
| September | 58.9 °F | 81.3 °F | 3.32 in. |
| October | 46.7 °F | 71.0 °F | 3.12 in. |
| November | 36.0 °F | 59.3 °F | 4.08 in. |
| December | 30.9 °F | 50.1 °F | 5.13 in. |
| Annual | 46.7 °F | 68.7 °F | 51.06 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |