Mandeville, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 16 °C (low) to 25.4 °C (high). Annual precipitation averages 1633.2 Millimeters. 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 | 6.2 °C | 16.4 °C | 136.91 mm |
| February | 8.1 °C | 18.6 °C | 119.13 mm |
| March | 11.8 °C | 22 °C | 130.05 mm |
| April | 15.5 °C | 25.4 °C | 129.79 mm |
| May | 20.1 °C | 29.2 °C | 132.84 mm |
| June | 23.3 °C | 31.7 °C | 167.89 mm |
| July | 24.2 °C | 32.7 °C | 185.42 mm |
| August | 24.3 °C | 32.8 °C | 172.47 mm |
| September | 22.1 °C | 30.9 °C | 125.73 mm |
| October | 17.1 °C | 26.7 °C | 103.38 mm |
| November | 11.1 °C | 21.2 °C | 103.12 mm |
| December | 7.7 °C | 17.6 °C | 126.49 mm |
| Annual | 16 °C | 25.4 °C | 1633.22 mm |
| 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 : -6.7°C to -3.9°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 |