Winona, Ontario climate data is summarized below. Average annual temperatures range from 41.5 °F (low) to 55.8 °F (high). Annual precipitation averages 38 Inches. 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 | -21.5 °F | -17.9 °F | 1041.4 in. |
| February | -22.2 °F | -18.3 °F | 1016 in. |
| March | -19.2 °F | -14.9 °F | 2209.8 in. |
| April | -16.3 °F | -11.3 °F | 2590.8 in. |
| May | -13.1 °F | -7.5 °F | 2489.2 in. |
| June | -9.7 °F | -4.6 °F | 2463.8 in. |
| July | -8 °F | -2.9 °F | 2616.2 in. |
| August | -8.2 °F | -3.4 °F | 2362.2 in. |
| September | -10.4 °F | -5.8 °F | 1727.2 in. |
| October | -13.5 °F | -9.4 °F | 2336.8 in. |
| November | -16.7 °F | -13 °F | 1676.4 in. |
| December | -19.3 °F | -16.3 °F | 1955.8 in. |
| Annual | 41.5 °F | 55.8 °F | 37.96 in. |
| 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 : 0°F to 5°F |
| Current Drought Conditions | Normal |