Brookhaven, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.1 °C (low) to 24.7 °C (high). Annual precipitation averages 1574.8 Millimeters. Brookhaven is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.7 °C | 14.8 °C | 156.46 mm |
| February | 4.3 °C | 17.1 °C | 153.92 mm |
| March | 7.7 °C | 21.1 °C | 151.13 mm |
| April | 11.4 °C | 24.7 °C | 139.95 mm |
| May | 16.2 °C | 28.4 °C | 114.05 mm |
| June | 20.2 °C | 31.7 °C | 127.51 mm |
| July | 21.4 °C | 32.7 °C | 150.62 mm |
| August | 21.1 °C | 32.9 °C | 128.02 mm |
| September | 18.2 °C | 30.6 °C | 108.2 mm |
| October | 11.8 °C | 25.9 °C | 90.93 mm |
| November | 6.7 °C | 20.1 °C | 112.27 mm |
| December | 3.9 °C | 15.8 °C | 141.73 mm |
| Annual | 12.1 °C | 24.7 °C | 1574.79 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |