Brownsville, Florida has a Tropical Monsoon climate (Köppen classification: Am). Average annual temperatures range from 21.2 °C (low) to 28.7 °C (high). Annual precipitation averages 1664 Millimeters. Brownsville is located in USDA Plant Hardiness Zone 11a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.7 °C | 24.4 °C | 57.66 mm |
| February | 16.9 °C | 25.4 °C | 61.47 mm |
| March | 18.3 °C | 26.5 °C | 67.56 mm |
| April | 20.6 °C | 28.3 °C | 83.57 mm |
| May | 22.8 °C | 29.9 °C | 146.56 mm |
| June | 24.3 °C | 31.3 °C | 240.54 mm |
| July | 25.2 °C | 32.2 °C | 199.39 mm |
| August | 25.2 °C | 32.4 °C | 221.49 mm |
| September | 24.7 °C | 31.6 °C | 240.28 mm |
| October | 23.1 °C | 29.9 °C | 196.6 mm |
| November | 19.9 °C | 27.2 °C | 82.04 mm |
| December | 17.6 °C | 25.4 °C | 66.8 mm |
| Annual | 21.2 °C | 28.7 °C | 1663.96 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 11a : 4.4°C to 7.2°C |
| Plant Hardiness Zone - 2012 | Zone 10b : 1.7°C to 4.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Am - Tropical Monsoon |