Marion, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52.6 °F (low) to 74.8 °F (high). Annual precipitation averages 54.5 Inches. Marion is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.0 °F | 55.7 °F | 5.31 in. |
| February | 37.3 °F | 60.0 °F | 5.58 in. |
| March | 43.5 °F | 68.2 °F | 5.64 in. |
| April | 50.6 °F | 74.8 °F | 4.73 in. |
| May | 60.2 °F | 82.3 °F | 3.65 in. |
| June | 67.8 °F | 88.3 °F | 4.28 in. |
| July | 71.0 °F | 90.5 °F | 4.98 in. |
| August | 70.4 °F | 90.6 °F | 4.25 in. |
| September | 64.5 °F | 86.3 °F | 3.86 in. |
| October | 53.0 °F | 76.8 °F | 3.3 in. |
| November | 41.8 °F | 65.9 °F | 4.38 in. |
| December | 36.6 °F | 57.8 °F | 4.57 in. |
| Annual | 52.6 °F | 74.8 °F | 54.53 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |