Marion, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52.7 °F (low) to 75.7 °F (high). Annual precipitation averages 57.4 Inches. Marion is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 33.6 °F | 56.2 °F | 5.54 in. |
| February | 36.7 °F | 60.6 °F | 5.06 in. |
| March | 43.5 °F | 68.7 °F | 5.54 in. |
| April | 51.6 °F | 76.1 °F | 5.78 in. |
| May | 61.0 °F | 82.9 °F | 4.91 in. |
| June | 68.6 °F | 89.5 °F | 4.05 in. |
| July | 71.7 °F | 92.3 °F | 4.12 in. |
| August | 70.8 °F | 93.0 °F | 3.84 in. |
| September | 63.9 °F | 87.9 °F | 3.95 in. |
| October | 52.3 °F | 77.6 °F | 4.45 in. |
| November | 42.5 °F | 66.3 °F | 4.56 in. |
| December | 36.5 °F | 57.8 °F | 5.61 in. |
| Annual | 52.7 °F | 75.7 °F | 57.41 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |