Winona, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.1 °C (low) to 13.7 °C (high). Annual precipitation averages 916.2 Millimeters. 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 | -12.9 °C | -3.3 °C | 30.99 mm |
| February | -11.1 °C | -0.7 °C | 28.96 mm |
| March | -4.4 °C | 6.1 °C | 50.29 mm |
| April | 2.6 °C | 14.2 °C | 98.04 mm |
| May | 9.1 °C | 20.9 °C | 114.05 mm |
| June | 14.9 °C | 26.3 °C | 125.22 mm |
| July | 17.2 °C | 28.4 °C | 105.16 mm |
| August | 16.1 °C | 27.3 °C | 119.13 mm |
| September | 11.6 °C | 23.2 °C | 99.06 mm |
| October | 4.6 °C | 15.6 °C | 64.01 mm |
| November | -2.1 °C | 6.8 °C | 47.5 mm |
| December | -8.9 °C | -0.4 °C | 33.78 mm |
| Annual | 3.1 °C | 13.7 °C | 916.19 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |