Marianna, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52 °F (low) to 71.4 °F (high). Annual precipitation averages 52.3 Inches. Marianna is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 31.7 °F | 48.5 °F | 3.98 in. |
| February | 34.8 °F | 53.2 °F | 4.42 in. |
| March | 42.7 °F | 62.1 °F | 5.6 in. |
| April | 51.8 °F | 72.0 °F | 5.72 in. |
| May | 61.6 °F | 80.4 °F | 5.01 in. |
| June | 69.2 °F | 87.9 °F | 3.95 in. |
| July | 71.9 °F | 90.4 °F | 3.92 in. |
| August | 69.9 °F | 90.2 °F | 2.83 in. |
| September | 62.8 °F | 84.9 °F | 3.0 in. |
| October | 51.4 °F | 74.4 °F | 3.89 in. |
| November | 41.4 °F | 61.3 °F | 4.48 in. |
| December | 34.9 °F | 51.5 °F | 5.54 in. |
| Annual | 52 °F | 71.4 °F | 52.34 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |