Big Rock, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.9 °F (low) to 68.8 °F (high). Annual precipitation averages 55.2 Inches. Big Rock is located in USDA Plant Hardiness Zone 7a. 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 | 27.0 °F | 45.1 °F | 4.27 in. |
| February | 29.9 °F | 49.8 °F | 4.54 in. |
| March | 37.6 °F | 59.3 °F | 5.05 in. |
| April | 46.8 °F | 69.9 °F | 5.24 in. |
| May | 57.0 °F | 77.7 °F | 6.12 in. |
| June | 65.2 °F | 85.2 °F | 4.83 in. |
| July | 68.5 °F | 88.5 °F | 4.75 in. |
| August | 67.0 °F | 88.3 °F | 3.33 in. |
| September | 59.4 °F | 82.4 °F | 3.61 in. |
| October | 47.9 °F | 71.4 °F | 3.97 in. |
| November | 37.3 °F | 58.9 °F | 4.36 in. |
| December | 30.7 °F | 48.6 °F | 5.16 in. |
| Annual | 47.9 °F | 68.8 °F | 55.23 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |