Grosse Tete, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.2 °C (low) to 25.8 °C (high). Annual precipitation averages 1619.8 Millimeters. Grosse Tete is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.1 °C | 16.7 °C | 159.51 mm |
| February | 6.9 °C | 18.9 °C | 123.19 mm |
| March | 10.4 °C | 22.7 °C | 111.76 mm |
| April | 13.7 °C | 25.9 °C | 133.35 mm |
| May | 18.2 °C | 29.6 °C | 145.8 mm |
| June | 21.8 °C | 32.2 °C | 169.42 mm |
| July | 22.9 °C | 33 °C | 144.53 mm |
| August | 22.6 °C | 33.3 °C | 155.7 mm |
| September | 20.2 °C | 31.3 °C | 120.65 mm |
| October | 14.3 °C | 27.1 °C | 117.86 mm |
| November | 8.7 °C | 21.6 °C | 107.44 mm |
| December | 5.9 °C | 17.8 °C | 130.56 mm |
| Annual | 14.2 °C | 25.8 °C | 1619.77 mm |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| 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 |