Sibley, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 53.8 °F (low) to 76.2 °F (high). Annual precipitation averages 56.3 Inches. Sibley is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.0 °F | 56.8 °F | 5.21 in. |
| February | 38.0 °F | 60.7 °F | 4.97 in. |
| March | 45.0 °F | 68.5 °F | 5.49 in. |
| April | 52.4 °F | 76.2 °F | 5.35 in. |
| May | 62.1 °F | 83.3 °F | 4.75 in. |
| June | 69.7 °F | 89.9 °F | 4.83 in. |
| July | 72.7 °F | 93.2 °F | 3.88 in. |
| August | 71.9 °F | 93.8 °F | 3.3 in. |
| September | 65.2 °F | 88.4 °F | 3.88 in. |
| October | 53.2 °F | 78.2 °F | 4.83 in. |
| November | 43.1 °F | 67.0 °F | 4.32 in. |
| December | 36.8 °F | 58.7 °F | 5.5 in. |
| Annual | 53.8 °F | 76.2 °F | 56.31 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |