Jefferson City, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.6 °C (low) to 20.6 °C (high). Annual precipitation averages 1228.3 Millimeters. Jefferson City 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 | -2.1 °C | 8.3 °C | 109.98 mm |
| February | -0.4 °C | 10.8 °C | 111.51 mm |
| March | 3 °C | 15.8 °C | 116.59 mm |
| April | 7.7 °C | 20.9 °C | 114.81 mm |
| May | 12.8 °C | 25.4 °C | 99.31 mm |
| June | 17.4 °C | 29.2 °C | 105.66 mm |
| July | 19.5 °C | 30.8 °C | 116.33 mm |
| August | 18.8 °C | 30.5 °C | 85.34 mm |
| September | 15.3 °C | 27.8 °C | 79.25 mm |
| October | 8.6 °C | 21.9 °C | 70.61 mm |
| November | 2.6 °C | 15.3 °C | 92.46 mm |
| December | -0.3 °C | 10.1 °C | 126.49 mm |
| Annual | 8.6 °C | 20.6 °C | 1228.34 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |