Jamestown, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45 °F (low) to 65.9 °F (high). Annual precipitation averages 59.1 Inches. Jamestown is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.0 °F | 44.0 °F | 5.07 in. |
| February | 28.3 °F | 48.6 °F | 4.6 in. |
| March | 34.7 °F | 57.1 °F | 5.6 in. |
| April | 43.5 °F | 67.1 °F | 5.5 in. |
| May | 53.3 °F | 74.6 °F | 5.3 in. |
| June | 60.8 °F | 80.7 °F | 5.54 in. |
| July | 64.4 °F | 83.7 °F | 5.67 in. |
| August | 63.2 °F | 83.3 °F | 4.49 in. |
| September | 56.9 °F | 78.5 °F | 4.11 in. |
| October | 44.9 °F | 68.7 °F | 3.21 in. |
| November | 35.2 °F | 56.6 °F | 4.07 in. |
| December | 29.2 °F | 47.4 °F | 5.98 in. |
| Annual | 45 °F | 65.9 °F | 59.14 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |