Mamou, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 57.8 °F (low) to 78.5 °F (high). Annual precipitation averages 60.8 Inches. Mamou is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 40.8 °F | 60.9 °F | 6.58 in. |
| February | 44.5 °F | 65.1 °F | 4.91 in. |
| March | 50.6 °F | 72.0 °F | 4.16 in. |
| April | 57.3 °F | 79.1 °F | 5.03 in. |
| May | 65.6 °F | 85.4 °F | 5.24 in. |
| June | 71.7 °F | 90.8 °F | 5.5 in. |
| July | 73.5 °F | 92.3 °F | 4.78 in. |
| August | 72.9 °F | 92.8 °F | 4.85 in. |
| September | 68.0 °F | 88.8 °F | 4.99 in. |
| October | 57.6 °F | 81.3 °F | 4.68 in. |
| November | 48.2 °F | 70.6 °F | 4.98 in. |
| December | 43.0 °F | 63.3 °F | 5.11 in. |
| Annual | 57.8 °F | 78.5 °F | 60.81 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| 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 |