Stonewall, Manitoba climate data is summarized below. Average annual temperatures range from 28.3 °F (low) to 46.7 °F (high). Annual precipitation averages 20.4 Inches. Stonewall is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -29.3 °F | -24.2 °F | 0 in. |
| February | -29 °F | -23.4 °F | 0 in. |
| March | -23.8 °F | -18.2 °F | 0 in. |
| April | -18.8 °F | -12.7 °F | 736.6 in. |
| May | -15 °F | -8.4 °F | 2438.4 in. |
| June | -11.4 °F | -5.2 °F | 3149.6 in. |
| July | -10.1 °F | -3.7 °F | 2438.4 in. |
| August | -10.6 °F | -4 °F | 2057.4 in. |
| September | -13.3 °F | -6.8 °F | 1168.4 in. |
| October | -16.8 °F | -11.7 °F | 1168.4 in. |
| November | -21.6 °F | -17.4 °F | 0 in. |
| December | -27.4 °F | -23.2 °F | 0 in. |
| Annual | 28.3 °F | 46.7 °F | 20.39 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Normal |