Winona, Ontario climate data is summarized below. Average annual temperatures range from 5.3 °C (low) to 13.2 °C (high). Annual precipitation averages 964 Millimeters. Winona is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.7 °C | -0.3 °C | 41 mm |
| February | -8.04 °C | -0.92 °C | 40 mm |
| March | -2.5 °C | 5.19 °C | 87 mm |
| April | 2.75 °C | 11.64 °C | 102 mm |
| May | 8.5 °C | 18.53 °C | 98 mm |
| June | 14.47 °C | 23.76 °C | 97 mm |
| July | 17.52 °C | 26.74 °C | 103 mm |
| August | 17.23 °C | 25.86 °C | 93 mm |
| September | 13.34 °C | 21.58 °C | 68 mm |
| October | 7.79 °C | 15 °C | 92 mm |
| November | 1.96 °C | 8.61 °C | 66 mm |
| December | -2.75 °C | 2.71 °C | 77 mm |
| Annual | 5.3 °C | 13.2 °C | 964 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |