Carlyss, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 15 °C (low) to 25.6 °C (high). Annual precipitation averages 1615.2 Millimeters. Carlyss is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.6 °C | 16.3 °C | 155.7 mm |
| February | 7.6 °C | 18.3 °C | 101.85 mm |
| March | 10.9 °C | 21.9 °C | 96.01 mm |
| April | 14.7 °C | 25.3 °C | 116.59 mm |
| May | 19.3 °C | 29.1 °C | 133.35 mm |
| June | 22.7 °C | 31.9 °C | 176.28 mm |
| July | 23.7 °C | 33 °C | 161.54 mm |
| August | 23.4 °C | 33.4 °C | 154.18 mm |
| September | 20.9 °C | 31.4 °C | 147.07 mm |
| October | 15.2 °C | 27.3 °C | 123.7 mm |
| November | 9.8 °C | 21.6 °C | 120.4 mm |
| December | 6.6 °C | 17.5 °C | 128.52 mm |
| Annual | 15 °C | 25.6 °C | 1615.19 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°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 |