Merryville, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.5 °C (low) to 25.6 °C (high). Annual precipitation averages 1521 Millimeters. Merryville 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.6 °C | 15.9 °C | 143 mm |
| February | 4.9 °C | 18 °C | 112.52 mm |
| March | 8.3 °C | 21.8 °C | 110.24 mm |
| April | 12.3 °C | 25.4 °C | 127.76 mm |
| May | 16.7 °C | 29.2 °C | 121.16 mm |
| June | 20.4 °C | 32.3 °C | 147.07 mm |
| July | 21.3 °C | 33.7 °C | 129.54 mm |
| August | 21.3 °C | 34.2 °C | 115.06 mm |
| September | 18.6 °C | 31.6 °C | 119.38 mm |
| October | 12.4 °C | 27.1 °C | 122.94 mm |
| November | 6.9 °C | 20.9 °C | 134.37 mm |
| December | 3.9 °C | 16.9 °C | 137.92 mm |
| Annual | 12.5 °C | 25.6 °C | 1520.96 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 20-30 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 |