Marion, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.5 °C (low) to 24.3 °C (high). Annual precipitation averages 1458.2 Millimeters. 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 | 0.9 °C | 13.4 °C | 140.72 mm |
| February | 2.6 °C | 15.9 °C | 128.52 mm |
| March | 6.4 °C | 20.4 °C | 140.72 mm |
| April | 10.9 °C | 24.5 °C | 146.81 mm |
| May | 16.1 °C | 28.3 °C | 124.71 mm |
| June | 20.3 °C | 31.9 °C | 102.87 mm |
| July | 22.1 °C | 33.5 °C | 104.65 mm |
| August | 21.6 °C | 33.9 °C | 97.54 mm |
| September | 17.7 °C | 31.1 °C | 100.33 mm |
| October | 11.3 °C | 25.3 °C | 113.03 mm |
| November | 5.8 °C | 19.1 °C | 115.82 mm |
| December | 2.5 °C | 14.3 °C | 142.49 mm |
| Annual | 11.5 °C | 24.3 °C | 1458.21 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |