Lexington, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.1 °C (low) to 21.4 °C (high). Annual precipitation averages 1410.5 Millimeters. Lexington is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.2 °C | 8.8 °C | 116.08 mm |
| February | -0.2 °C | 11.6 °C | 122.94 mm |
| March | 3.7 °C | 16.6 °C | 137.67 mm |
| April | 8.4 °C | 22 °C | 135.64 mm |
| May | 14 °C | 26.2 °C | 144.78 mm |
| June | 18.6 °C | 30.1 °C | 106.93 mm |
| July | 20.4 °C | 31.7 °C | 106.17 mm |
| August | 19.6 °C | 31.6 °C | 91.19 mm |
| September | 15.4 °C | 28.6 °C | 105.66 mm |
| October | 8.6 °C | 22.8 °C | 99.57 mm |
| November | 3.1 °C | 16.1 °C | 108.2 mm |
| December | -0.4 °C | 10.4 °C | 135.64 mm |
| Annual | 9.1 °C | 21.4 °C | 1410.47 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 75-100 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |