Sicily Island, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.7 °C (low) to 25.1 °C (high). Annual precipitation averages 1516.9 Millimeters. Sicily Island 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 | 2.9 °C | 14.4 °C | 146.05 mm |
| February | 4.2 °C | 16.9 °C | 136.4 mm |
| March | 8.4 °C | 21.2 °C | 139.7 mm |
| April | 12.4 °C | 25.1 °C | 145.8 mm |
| May | 17.2 °C | 29.2 °C | 121.92 mm |
| June | 21.1 °C | 32.4 °C | 122.94 mm |
| July | 22.4 °C | 33.7 °C | 117.09 mm |
| August | 21.8 °C | 33.9 °C | 107.19 mm |
| September | 18.8 °C | 31.4 °C | 100.08 mm |
| October | 12.3 °C | 26.7 °C | 109.98 mm |
| November | 7.1 °C | 20.3 °C | 128.02 mm |
| December | 3.9 °C | 15.7 °C | 141.73 mm |
| Annual | 12.7 °C | 25.1 °C | 1516.9 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°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 |