Belle Rose, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.8 °C (low) to 25.7 °C (high). Annual precipitation averages 1632.7 Millimeters. Belle Rose 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 | 5.7 °C | 16.8 °C | 147.83 mm |
| February | 7.7 °C | 18.9 °C | 107.7 mm |
| March | 10.9 °C | 22.4 °C | 105.66 mm |
| April | 14.2 °C | 25.7 °C | 127.51 mm |
| May | 18.7 °C | 29.3 °C | 149.1 mm |
| June | 22.2 °C | 31.8 °C | 183.64 mm |
| July | 23.2 °C | 32.6 °C | 162.81 mm |
| August | 23 °C | 32.8 °C | 173.99 mm |
| September | 20.9 °C | 31.1 °C | 134.37 mm |
| October | 15.1 °C | 26.9 °C | 114.05 mm |
| November | 9.5 °C | 21.8 °C | 104.9 mm |
| December | 6.8 °C | 18.1 °C | 121.16 mm |
| Annual | 14.8 °C | 25.7 °C | 1632.72 mm |
| 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 : -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 |