Cowan, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.9 °F (low) to 69.5 °F (high). Annual precipitation averages 58.6 Inches. Cowan 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 | 29.1 °F | 48.2 °F | 5.11 in. |
| February | 31.6 °F | 52.4 °F | 5.16 in. |
| March | 38.2 °F | 60.8 °F | 5.55 in. |
| April | 46.7 °F | 70.4 °F | 5.42 in. |
| May | 56.0 °F | 77.9 °F | 4.64 in. |
| June | 63.7 °F | 84.4 °F | 5.44 in. |
| July | 67.3 °F | 87.4 °F | 4.81 in. |
| August | 65.9 °F | 87.1 °F | 4.08 in. |
| September | 59.5 °F | 81.9 °F | 4.32 in. |
| October | 47.4 °F | 72.0 °F | 3.42 in. |
| November | 37.0 °F | 60.4 °F | 4.39 in. |
| December | 32.1 °F | 51.3 °F | 6.27 in. |
| Annual | 47.9 °F | 69.5 °F | 58.61 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |