Cottonport, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.7 °C (low) to 25.4 °C (high). Annual precipitation averages 1552.4 Millimeters. Cottonport is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.9 °C | 15.4 °C | 164.08 mm |
| February | 6 °C | 17.8 °C | 130.56 mm |
| March | 9.6 °C | 21.9 °C | 118.87 mm |
| April | 13.3 °C | 25.6 °C | 136.14 mm |
| May | 18.1 °C | 29.3 °C | 128.78 mm |
| June | 21.7 °C | 32.3 °C | 131.57 mm |
| July | 22.8 °C | 33.3 °C | 118.87 mm |
| August | 22.4 °C | 33.7 °C | 117.6 mm |
| September | 19.6 °C | 31.3 °C | 112.78 mm |
| October | 13.5 °C | 26.7 °C | 114.81 mm |
| November | 7.9 °C | 20.9 °C | 135.89 mm |
| December | 5.2 °C | 16.7 °C | 142.49 mm |
| Annual | 13.7 °C | 25.4 °C | 1552.44 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| 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 |