Brownsville, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.1 °C (low) to 21.4 °C (high). Annual precipitation averages 1394.7 Millimeters. Brownsville is located in USDA Plant Hardiness Zone 8a. 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 | -1.3 °C | 8.5 °C | 104.65 mm |
| February | 0.4 °C | 11.2 °C | 125.73 mm |
| March | 4.7 °C | 16.2 °C | 140.21 mm |
| April | 9.7 °C | 21.9 °C | 134.11 mm |
| May | 15.3 °C | 26.5 °C | 139.7 mm |
| June | 19.7 °C | 30.5 °C | 113.54 mm |
| July | 21.4 °C | 32.2 °C | 103.63 mm |
| August | 20.3 °C | 31.9 °C | 81.79 mm |
| September | 16.3 °C | 28.7 °C | 98.04 mm |
| October | 9.7 °C | 23 °C | 95.76 mm |
| November | 4.1 °C | 15.9 °C | 118.87 mm |
| December | 0.4 °C | 10.3 °C | 138.68 mm |
| Annual | 10.1 °C | 21.4 °C | 1394.71 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 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |