Killona, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 60.6 °F (low) to 78.5 °F (high). Annual precipitation averages 66 Inches. Killona is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 44.1 °F | 62.8 °F | 5.75 in. |
| February | 47.4 °F | 66.6 °F | 4.37 in. |
| March | 53.5 °F | 72.8 °F | 4.57 in. |
| April | 59.5 °F | 78.3 °F | 5.03 in. |
| May | 67.4 °F | 84.7 °F | 5.79 in. |
| June | 73.3 °F | 89.5 °F | 7.76 in. |
| July | 75.1 °F | 91.1 °F | 7.51 in. |
| August | 74.7 °F | 91.3 °F | 6.7 in. |
| September | 71.4 °F | 88.0 °F | 5.39 in. |
| October | 61.9 °F | 80.5 °F | 4.12 in. |
| November | 51.9 °F | 71.4 °F | 4.1 in. |
| December | 46.5 °F | 65.0 °F | 4.94 in. |
| Annual | 60.6 °F | 78.5 °F | 66.03 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |