Grand Point, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 15 °C (low) to 25.9 °C (high). Annual precipitation averages 1677.7 Millimeters. Grand Point is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6 °C | 17.1 °C | 145.8 mm |
| February | 7.9 °C | 19.2 °C | 107.19 mm |
| March | 11.2 °C | 22.6 °C | 108.97 mm |
| April | 14.4 °C | 25.7 °C | 127.76 mm |
| May | 18.9 °C | 29.3 °C | 161.29 mm |
| June | 22.2 °C | 31.9 °C | 201.17 mm |
| July | 23.3 °C | 32.8 °C | 176.53 mm |
| August | 23.1 °C | 33 °C | 186.44 mm |
| September | 21.1 °C | 31.2 °C | 132.59 mm |
| October | 15.3 °C | 27.2 °C | 105.92 mm |
| November | 9.8 °C | 21.9 °C | 103.63 mm |
| December | 7.1 °C | 18.3 °C | 120.4 mm |
| Annual | 15 °C | 25.9 °C | 1677.69 mm |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| 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 |