Mangham, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54.1 °F (low) to 76.4 °F (high). Annual precipitation averages 57.9 Inches. Mangham is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.7 °F | 56.2 °F | 5.61 in. |
| February | 38.6 °F | 60.7 °F | 5.07 in. |
| March | 45.9 °F | 68.5 °F | 5.38 in. |
| April | 53.4 °F | 76.5 °F | 6.09 in. |
| May | 62.6 °F | 84.2 °F | 4.9 in. |
| June | 69.7 °F | 90.3 °F | 4.38 in. |
| July | 72.5 °F | 93.0 °F | 4.09 in. |
| August | 71.4 °F | 93.6 °F | 3.79 in. |
| September | 65.1 °F | 88.8 °F | 3.61 in. |
| October | 53.4 °F | 79.2 °F | 4.43 in. |
| November | 43.7 °F | 67.2 °F | 4.87 in. |
| December | 37.7 °F | 58.8 °F | 5.63 in. |
| Annual | 54.1 °F | 76.4 °F | 57.85 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |