Gainesboro, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.9 °C (low) to 20.7 °C (high). Annual precipitation averages 1464.6 Millimeters. Gainesboro is located in USDA Plant Hardiness Zone 7b. 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 | -2.9 °C | 8.1 °C | 121.16 mm |
| February | -1.5 °C | 10.6 °C | 132.08 mm |
| March | 2 °C | 15.4 °C | 134.37 mm |
| April | 6.8 °C | 21.2 °C | 123.19 mm |
| May | 12.3 °C | 25.7 °C | 131.32 mm |
| June | 16.9 °C | 29.4 °C | 143.26 mm |
| July | 19.2 °C | 31.2 °C | 133.86 mm |
| August | 18.3 °C | 30.9 °C | 103.38 mm |
| September | 14.6 °C | 27.8 °C | 100.33 mm |
| October | 7.7 °C | 22.1 °C | 88.14 mm |
| November | 2.1 °C | 15.4 °C | 101.35 mm |
| December | -1.1 °C | 10 °C | 152.15 mm |
| Annual | 7.9 °C | 20.7 °C | 1464.59 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 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |