Duson, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 58.3 °F (low) to 78.1 °F (high). Annual precipitation averages 63.3 Inches. Duson 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 | 41.7 °F | 61.5 °F | 6.38 in. |
| February | 45.1 °F | 65.0 °F | 4.41 in. |
| March | 51.3 °F | 71.7 °F | 3.86 in. |
| April | 57.8 °F | 78.2 °F | 5.02 in. |
| May | 65.9 °F | 84.7 °F | 5.42 in. |
| June | 72.0 °F | 89.9 °F | 6.59 in. |
| July | 73.8 °F | 91.1 °F | 5.79 in. |
| August | 73.1 °F | 91.8 °F | 5.78 in. |
| September | 68.7 °F | 88.1 °F | 5.42 in. |
| October | 58.2 °F | 80.7 °F | 4.9 in. |
| November | 48.7 °F | 70.9 °F | 4.89 in. |
| December | 43.4 °F | 63.6 °F | 4.87 in. |
| Annual | 58.3 °F | 78.1 °F | 63.33 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |