Delta, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.5 °C (low) to 24.4 °C (high). Annual precipitation averages 1483.4 Millimeters. Delta is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.4 °C | 13.5 °C | 142.49 mm |
| February | 4.2 °C | 16.1 °C | 136.4 mm |
| March | 8.1 °C | 20.5 °C | 144.78 mm |
| April | 12.3 °C | 24.6 °C | 167.13 mm |
| May | 17.3 °C | 28.7 °C | 117.86 mm |
| June | 21.1 °C | 31.9 °C | 112.52 mm |
| July | 22.4 °C | 33.1 °C | 106.68 mm |
| August | 21.8 °C | 33.2 °C | 97.54 mm |
| September | 18.4 °C | 30.9 °C | 94.49 mm |
| October | 12.1 °C | 25.8 °C | 99.31 mm |
| November | 6.4 °C | 19.6 °C | 124.97 mm |
| December | 3.6 °C | 15.1 °C | 139.19 mm |
| Annual | 12.5 °C | 24.4 °C | 1483.36 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |