Lacassine, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 15 °C (low) to 25.4 °C (high). Annual precipitation averages 1565.7 Millimeters. Lacassine 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 Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.4 °C | 16 °C | 157.23 mm |
| February | 7.4 °C | 18.1 °C | 109.22 mm |
| March | 10.9 °C | 21.8 °C | 96.27 mm |
| April | 14.7 °C | 25.2 °C | 123.19 mm |
| May | 19.3 °C | 28.9 °C | 129.79 mm |
| June | 22.6 °C | 31.8 °C | 164.59 mm |
| July | 23.6 °C | 32.8 °C | 144.78 mm |
| August | 23.3 °C | 33.2 °C | 145.29 mm |
| September | 20.8 °C | 31.2 °C | 138.43 mm |
| October | 15.2 °C | 27.1 °C | 112.01 mm |
| November | 9.7 °C | 21.3 °C | 118.62 mm |
| December | 6.5 °C | 17.3 °C | 126.24 mm |
| Annual | 15 °C | 25.4 °C | 1565.66 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| 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 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |