Big Rock, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.8 °C (low) to 20.4 °C (high). Annual precipitation averages 1402.8 Millimeters. 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 | -2.8 °C | 7.3 °C | 108.46 mm |
| February | -1.2 °C | 9.9 °C | 115.32 mm |
| March | 3.1 °C | 15.2 °C | 128.27 mm |
| April | 8.2 °C | 21.1 °C | 133.1 mm |
| May | 13.9 °C | 25.4 °C | 155.45 mm |
| June | 18.4 °C | 29.6 °C | 122.68 mm |
| July | 20.3 °C | 31.4 °C | 120.65 mm |
| August | 19.4 °C | 31.3 °C | 84.58 mm |
| September | 15.2 °C | 28 °C | 91.69 mm |
| October | 8.8 °C | 21.9 °C | 100.84 mm |
| November | 2.9 °C | 14.9 °C | 110.74 mm |
| December | -0.7 °C | 9.2 °C | 131.06 mm |
| Annual | 8.8 °C | 20.4 °C | 1402.84 mm |
| 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 : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |