Watertown, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.1 °F (low) to 69.9 °F (high). Annual precipitation averages 56.3 Inches. Watertown 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 | 27.7 °F | 47.4 °F | 4.89 in. |
| February | 30.3 °F | 51.9 °F | 5.01 in. |
| March | 37.2 °F | 60.7 °F | 5.25 in. |
| April | 45.7 °F | 70.6 °F | 4.8 in. |
| May | 55.3 °F | 78.6 °F | 5.0 in. |
| June | 63.6 °F | 85.9 °F | 4.9 in. |
| July | 67.7 °F | 89.0 °F | 5.5 in. |
| August | 65.9 °F | 88.4 °F | 3.88 in. |
| September | 58.6 °F | 83.2 °F | 3.97 in. |
| October | 46.5 °F | 72.5 °F | 3.54 in. |
| November | 36.2 °F | 60.3 °F | 3.74 in. |
| December | 30.9 °F | 50.6 °F | 5.83 in. |
| Annual | 47.1 °F | 69.9 °F | 56.31 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 |