Merrydale, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.1 °C (low) to 25.7 °C (high). Annual precipitation averages 1658.4 Millimeters. Merrydale 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 | 4.8 °C | 16.5 °C | 162.31 mm |
| February | 6.7 °C | 18.7 °C | 126.75 mm |
| March | 10.1 °C | 22.4 °C | 119.38 mm |
| April | 13.6 °C | 25.8 °C | 131.32 mm |
| May | 18.1 °C | 29.5 °C | 147.32 mm |
| June | 21.6 °C | 32.1 °C | 169.67 mm |
| July | 22.8 °C | 32.9 °C | 149.35 mm |
| August | 22.6 °C | 33.2 °C | 167.13 mm |
| September | 20.2 °C | 31.3 °C | 120.4 mm |
| October | 14.1 °C | 26.9 °C | 122.43 mm |
| November | 8.6 °C | 21.4 °C | 106.17 mm |
| December | 5.8 °C | 17.6 °C | 136.14 mm |
| Annual | 14.1 °C | 25.7 °C | 1658.37 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 |