Oretta, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.8 °C (low) to 25.5 °C (high). Annual precipitation averages 1577.3 Millimeters. Oretta 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 Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.3 °C | 16.1 °C | 153.92 mm |
| February | 6.3 °C | 18.2 °C | 105.41 mm |
| March | 9.7 °C | 21.9 °C | 103.89 mm |
| April | 13.4 °C | 25.3 °C | 120.9 mm |
| May | 18 °C | 29.1 °C | 127 mm |
| June | 21.5 °C | 31.9 °C | 155.45 mm |
| July | 22.6 °C | 33.1 °C | 143.51 mm |
| August | 22.4 °C | 33.5 °C | 136.14 mm |
| September | 19.8 °C | 31.3 °C | 132.33 mm |
| October | 13.9 °C | 27 °C | 128.78 mm |
| November | 8.5 °C | 21.2 °C | 133.6 mm |
| December | 5.4 °C | 17.2 °C | 136.4 mm |
| Annual | 13.8 °C | 25.5 °C | 1577.33 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| 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 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |