Byrdstown, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.7 °C (low) to 20 °C (high). Annual precipitation averages 1371.6 Millimeters. Byrdstown is located in USDA Plant Hardiness Zone 7a. 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 | -3.2 °C | 7.4 °C | 116.84 mm |
| February | -1.6 °C | 10.1 °C | 114.55 mm |
| March | 2.1 °C | 14.8 °C | 129.79 mm |
| April | 7 °C | 20.7 °C | 127.76 mm |
| May | 12.3 °C | 24.8 °C | 121.67 mm |
| June | 16.6 °C | 28.7 °C | 128.02 mm |
| July | 18.7 °C | 30.3 °C | 127.76 mm |
| August | 18.1 °C | 30 °C | 98.04 mm |
| September | 14.3 °C | 27.2 °C | 89.66 mm |
| October | 7.4 °C | 21.6 °C | 81.79 mm |
| November | 2.2 °C | 14.9 °C | 96.27 mm |
| December | -1.2 °C | 9.4 °C | 139.45 mm |
| Annual | 7.7 °C | 20 °C | 1371.6 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |