Marianna, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 56.2 °F (low) to 78.7 °F (high). Annual precipitation averages 58.7 Inches. Marianna is located in USDA Plant Hardiness Zone 9a. 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 | 39.4 °F | 62.6 °F | 4.73 in. |
| February | 42.4 °F | 66.0 °F | 4.86 in. |
| March | 47.7 °F | 73.0 °F | 4.99 in. |
| April | 54.4 °F | 79.2 °F | 5.08 in. |
| May | 63.0 °F | 86.5 °F | 3.74 in. |
| June | 70.1 °F | 90.2 °F | 5.93 in. |
| July | 72.1 °F | 91.9 °F | 6.73 in. |
| August | 71.8 °F | 91.0 °F | 5.83 in. |
| September | 67.6 °F | 87.7 °F | 5.32 in. |
| October | 57.1 °F | 80.3 °F | 3.15 in. |
| November | 46.4 °F | 71.3 °F | 3.7 in. |
| December | 41.9 °F | 64.5 °F | 4.61 in. |
| Annual | 56.2 °F | 78.7 °F | 58.67 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |