Hornbeck, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.2 °C (low) to 25.2 °C (high). Annual precipitation averages 1460.7 Millimeters. Hornbeck is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.4 °C | 14.9 °C | 148.84 mm |
| February | 5.3 °C | 17.4 °C | 119.13 mm |
| March | 8.9 °C | 21.5 °C | 125.22 mm |
| April | 12.8 °C | 25.2 °C | 123.95 mm |
| May | 17.4 °C | 29.2 °C | 124.46 mm |
| June | 21.2 °C | 32.4 °C | 119.63 mm |
| July | 22.4 °C | 33.8 °C | 104.39 mm |
| August | 22.2 °C | 34.3 °C | 104.9 mm |
| September | 19.2 °C | 31.4 °C | 98.3 mm |
| October | 13.3 °C | 26.4 °C | 116.84 mm |
| November | 7.8 °C | 20.4 °C | 135.89 mm |
| December | 4.4 °C | 16 °C | 139.19 mm |
| Annual | 13.2 °C | 25.2 °C | 1460.74 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |