Mandeville, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 60.7 °F (low) to 77.8 °F (high). Annual precipitation averages 64.3 Inches. Mandeville 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 Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 43.1 °F | 61.6 °F | 5.39 in. |
| February | 46.5 °F | 65.4 °F | 4.69 in. |
| March | 53.3 °F | 71.6 °F | 5.12 in. |
| April | 59.9 °F | 77.7 °F | 5.11 in. |
| May | 68.2 °F | 84.5 °F | 5.23 in. |
| June | 73.9 °F | 89.0 °F | 6.61 in. |
| July | 75.6 °F | 90.8 °F | 7.3 in. |
| August | 75.8 °F | 91.1 °F | 6.79 in. |
| September | 71.7 °F | 87.7 °F | 4.95 in. |
| October | 62.7 °F | 80.0 °F | 4.07 in. |
| November | 51.9 °F | 70.2 °F | 4.06 in. |
| December | 45.8 °F | 63.7 °F | 4.98 in. |
| Annual | 60.7 °F | 77.8 °F | 64.3 in. |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| 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 |