Big Sandy, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.9 °C (low) to 21.1 °C (high). Annual precipitation averages 1398.3 Millimeters. Big Sandy 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.1 °C | 8.2 °C | 104.39 mm |
| February | -0.6 °C | 10.8 °C | 121.67 mm |
| March | 3.4 °C | 16.2 °C | 131.32 mm |
| April | 8.3 °C | 21.9 °C | 128.78 mm |
| May | 13.7 °C | 26.1 °C | 144.53 mm |
| June | 18.4 °C | 30.2 °C | 109.47 mm |
| July | 20.4 °C | 31.8 °C | 109.47 mm |
| August | 19.3 °C | 31.7 °C | 95.25 mm |
| September | 15.3 °C | 28.6 °C | 100.08 mm |
| October | 8.5 °C | 22.5 °C | 103.12 mm |
| November | 2.9 °C | 15.6 °C | 117.6 mm |
| December | -0.7 °C | 9.9 °C | 132.59 mm |
| Annual | 8.9 °C | 21.1 °C | 1398.27 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| 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 |