Winona, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.5 °F (low) to 56.7 °F (high). Annual precipitation averages 36.1 Inches. Winona is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.8 °F | 26.0 °F | 1.22 in. |
| February | 12.1 °F | 30.7 °F | 1.14 in. |
| March | 24.1 °F | 43.0 °F | 1.98 in. |
| April | 36.7 °F | 57.6 °F | 3.86 in. |
| May | 48.3 °F | 69.7 °F | 4.49 in. |
| June | 58.8 °F | 79.4 °F | 4.93 in. |
| July | 62.9 °F | 83.2 °F | 4.14 in. |
| August | 60.9 °F | 81.2 °F | 4.69 in. |
| September | 52.8 °F | 73.8 °F | 3.9 in. |
| October | 40.3 °F | 60.1 °F | 2.52 in. |
| November | 28.2 °F | 44.2 °F | 1.87 in. |
| December | 16.0 °F | 31.2 °F | 1.33 in. |
| Annual | 37.5 °F | 56.7 °F | 36.07 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |