Marianna, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.4 °C (low) to 25.9 °C (high). Annual precipitation averages 1490.2 Millimeters. 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 | 4.1 °C | 17 °C | 120.14 mm |
| February | 5.8 °C | 18.9 °C | 123.44 mm |
| March | 8.7 °C | 22.8 °C | 126.75 mm |
| April | 12.4 °C | 26.2 °C | 129.03 mm |
| May | 17.2 °C | 30.3 °C | 95 mm |
| June | 21.2 °C | 32.3 °C | 150.62 mm |
| July | 22.3 °C | 33.3 °C | 170.94 mm |
| August | 22.1 °C | 32.8 °C | 148.08 mm |
| September | 19.8 °C | 30.9 °C | 135.13 mm |
| October | 13.9 °C | 26.8 °C | 80.01 mm |
| November | 8 °C | 21.8 °C | 93.98 mm |
| December | 5.5 °C | 18.1 °C | 117.09 mm |
| Annual | 13.4 °C | 25.9 °C | 1490.21 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |