Des Allemands, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 15.9 °C (low) to 25.8 °C (high). Annual precipitation averages 1634.7 Millimeters. Des Allemands is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.8 °C | 17.3 °C | 134.87 mm |
| February | 8.8 °C | 19.3 °C | 118.11 mm |
| March | 12.1 °C | 22.6 °C | 109.47 mm |
| April | 15.6 °C | 25.6 °C | 124.97 mm |
| May | 19.7 °C | 29.2 °C | 141.48 mm |
| June | 22.8 °C | 31.6 °C | 174.75 mm |
| July | 23.8 °C | 32.7 °C | 182.88 mm |
| August | 23.6 °C | 32.8 °C | 166.88 mm |
| September | 21.8 °C | 30.9 °C | 149.1 mm |
| October | 16.4 °C | 27.2 °C | 98.04 mm |
| November | 10.8 °C | 22 °C | 102.62 mm |
| December | 8 °C | 18.6 °C | 131.57 mm |
| Annual | 15.9 °C | 25.8 °C | 1634.74 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°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 |