Winona, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.3 °C (low) to 22.8 °C (high). Annual precipitation averages 1487.4 Millimeters. Winona is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.1 °C | 11.8 °C | 133.86 mm |
| February | 1.5 °C | 14.3 °C | 134.62 mm |
| March | 5.4 °C | 18.9 °C | 144.78 mm |
| April | 9.7 °C | 22.9 °C | 152.4 mm |
| May | 14.9 °C | 27 °C | 132.33 mm |
| June | 19.2 °C | 30.5 °C | 111 mm |
| July | 21 °C | 31.9 °C | 120.65 mm |
| August | 20.3 °C | 32 °C | 101.6 mm |
| September | 16.6 °C | 29.5 °C | 97.79 mm |
| October | 10 °C | 24.2 °C | 92.46 mm |
| November | 4.3 °C | 18 °C | 115.32 mm |
| December | 1.2 °C | 13.1 °C | 150.62 mm |
| Annual | 10.3 °C | 22.8 °C | 1487.43 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |