Waynesboro, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.2 °C (low) to 21.3 °C (high). Annual precipitation averages 1534.9 Millimeters. Waynesboro 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 | -2.5 °C | 9.2 °C | 130.3 mm |
| February | -0.9 °C | 12 °C | 137.92 mm |
| March | 2.6 °C | 16.6 °C | 137.41 mm |
| April | 7.3 °C | 22.1 °C | 145.03 mm |
| May | 12.6 °C | 25.9 °C | 137.41 mm |
| June | 17.2 °C | 29.5 °C | 125.98 mm |
| July | 19.3 °C | 31.4 °C | 137.16 mm |
| August | 18.5 °C | 31.2 °C | 111.25 mm |
| September | 14.7 °C | 28.4 °C | 108.2 mm |
| October | 7.6 °C | 22.8 °C | 101.6 mm |
| November | 2.2 °C | 16.1 °C | 105.92 mm |
| December | -0.8 °C | 10.8 °C | 156.72 mm |
| Annual | 8.2 °C | 21.3 °C | 1534.9 mm |
| 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 : -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 |