Cecilia, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 58.3 °F (low) to 78.4 °F (high). Annual precipitation averages 63.6 Inches. Cecilia 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 | 42.0 °F | 62.1 °F | 6.49 in. |
| February | 45.3 °F | 65.7 °F | 4.65 in. |
| March | 51.6 °F | 72.4 °F | 4.1 in. |
| April | 57.5 °F | 78.3 °F | 5.19 in. |
| May | 65.6 °F | 85.0 °F | 5.62 in. |
| June | 71.7 °F | 89.7 °F | 6.51 in. |
| July | 73.7 °F | 91.1 °F | 5.65 in. |
| August | 72.9 °F | 91.6 °F | 5.87 in. |
| September | 68.6 °F | 88.2 °F | 5.18 in. |
| October | 58.1 °F | 80.7 °F | 4.7 in. |
| November | 48.6 °F | 71.2 °F | 4.75 in. |
| December | 43.7 °F | 64.2 °F | 4.93 in. |
| Annual | 58.3 °F | 78.4 °F | 63.64 in. |
| 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 : 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 |