Big Sandy, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 53.6 °F (low) to 76.2 °F (high). Annual precipitation averages 46.9 Inches. Big Sandy is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.6 °F | 56.6 °F | 3.86 in. |
| February | 38.1 °F | 61.0 °F | 4.02 in. |
| March | 45.1 °F | 68.5 °F | 4.43 in. |
| April | 52.2 °F | 76.2 °F | 4.15 in. |
| May | 62.0 °F | 83.0 °F | 4.58 in. |
| June | 69.4 °F | 89.9 °F | 4.04 in. |
| July | 72.4 °F | 93.4 °F | 2.87 in. |
| August | 71.4 °F | 94.4 °F | 2.75 in. |
| September | 64.8 °F | 88.3 °F | 3.56 in. |
| October | 53.4 °F | 78.2 °F | 4.52 in. |
| November | 43.5 °F | 66.8 °F | 3.79 in. |
| December | 36.3 °F | 58.3 °F | 4.33 in. |
| Annual | 53.6 °F | 76.2 °F | 46.9 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |