Broussard, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.7 °C (low) to 25.6 °C (high). Annual precipitation averages 1620.5 Millimeters. Broussard is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.7 °C | 16.6 °C | 157.99 mm |
| February | 7.5 °C | 18.6 °C | 113.79 mm |
| March | 10.9 °C | 22.2 °C | 101.09 mm |
| April | 14.3 °C | 25.5 °C | 132.84 mm |
| May | 18.8 °C | 29.2 °C | 132.59 mm |
| June | 22.2 °C | 31.9 °C | 169.16 mm |
| July | 23.2 °C | 32.7 °C | 156.21 mm |
| August | 22.9 °C | 33 °C | 156.97 mm |
| September | 20.5 °C | 31.1 °C | 134.62 mm |
| October | 14.7 °C | 27 °C | 118.87 mm |
| November | 9.4 °C | 21.7 °C | 123.95 mm |
| December | 6.6 °C | 17.8 °C | 122.43 mm |
| Annual | 14.7 °C | 25.6 °C | 1620.51 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |