Big Sandy, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 48.1 °F (low) to 70 °F (high). Annual precipitation averages 55.1 Inches. 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 | 28.2 °F | 46.7 °F | 4.11 in. |
| February | 30.9 °F | 51.5 °F | 4.79 in. |
| March | 38.2 °F | 61.1 °F | 5.17 in. |
| April | 47.0 °F | 71.5 °F | 5.07 in. |
| May | 56.7 °F | 79.0 °F | 5.69 in. |
| June | 65.2 °F | 86.4 °F | 4.31 in. |
| July | 68.8 °F | 89.2 °F | 4.31 in. |
| August | 66.8 °F | 89.0 °F | 3.75 in. |
| September | 59.5 °F | 83.4 °F | 3.94 in. |
| October | 47.3 °F | 72.5 °F | 4.06 in. |
| November | 37.3 °F | 60.1 °F | 4.63 in. |
| December | 30.8 °F | 49.9 °F | 5.22 in. |
| Annual | 48.1 °F | 70 °F | 55.05 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |