Lacassine, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 58.9 °F (low) to 77.7 °F (high). Annual precipitation averages 61.6 Inches. 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 | 41.8 °F | 60.8 °F | 6.19 in. |
| February | 45.4 °F | 64.6 °F | 4.3 in. |
| March | 51.6 °F | 71.2 °F | 3.79 in. |
| April | 58.5 °F | 77.4 °F | 4.85 in. |
| May | 66.7 °F | 84.1 °F | 5.11 in. |
| June | 72.7 °F | 89.3 °F | 6.48 in. |
| July | 74.5 °F | 91.0 °F | 5.7 in. |
| August | 73.9 °F | 91.7 °F | 5.72 in. |
| September | 69.5 °F | 88.2 °F | 5.45 in. |
| October | 59.3 °F | 80.7 °F | 4.41 in. |
| November | 49.4 °F | 70.4 °F | 4.67 in. |
| December | 43.7 °F | 63.1 °F | 4.97 in. |
| Annual | 58.9 °F | 77.7 °F | 61.64 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |