Supreme, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 59.5 °F (low) to 78.1 °F (high). Annual precipitation averages 64.8 Inches. Supreme is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Jan. 1 - Jan. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 43.3 °F | 62.6 °F | 5.81 in. |
| February | 47.0 °F | 66.3 °F | 4.21 in. |
| March | 52.6 °F | 72.2 °F | 4.21 in. |
| April | 58.6 °F | 77.7 °F | 4.98 in. |
| May | 66.5 °F | 84.1 °F | 5.87 in. |
| June | 72.3 °F | 88.6 °F | 7.69 in. |
| July | 74.2 °F | 90.2 °F | 6.8 in. |
| August | 73.9 °F | 90.6 °F | 6.84 in. |
| September | 70.3 °F | 87.5 °F | 5.47 in. |
| October | 60.2 °F | 80.4 °F | 4.38 in. |
| November | 50.2 °F | 71.4 °F | 4.11 in. |
| December | 45.3 °F | 65.0 °F | 4.46 in. |
| Annual | 59.5 °F | 78.1 °F | 64.83 in. |
| Average First Frost Date | Jan. 1 - Jan. 10 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |