Killona, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 15.9 °C (low) to 25.8 °C (high). Annual precipitation averages 1677.2 Millimeters. Killona is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.7 °C | 17.1 °C | 146.05 mm |
| February | 8.6 °C | 19.2 °C | 111 mm |
| March | 11.9 °C | 22.7 °C | 116.08 mm |
| April | 15.3 °C | 25.7 °C | 127.76 mm |
| May | 19.7 °C | 29.3 °C | 147.07 mm |
| June | 22.9 °C | 31.9 °C | 197.1 mm |
| July | 23.9 °C | 32.8 °C | 190.75 mm |
| August | 23.7 °C | 32.9 °C | 170.18 mm |
| September | 21.9 °C | 31.1 °C | 136.91 mm |
| October | 16.6 °C | 26.9 °C | 104.65 mm |
| November | 11.1 °C | 21.9 °C | 104.14 mm |
| December | 8.1 °C | 18.3 °C | 125.48 mm |
| Annual | 15.9 °C | 25.8 °C | 1677.17 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| 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 |