Stonewall, Manitoba climate data is summarized below. Average annual temperatures range from -2.1 °C (low) to 8.2 °C (high). Annual precipitation averages 518 Millimeters. 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 | -20.71 °C | -11.54 °C | 0 mm |
| February | -20.14 °C | -10.04 °C | 0 mm |
| March | -10.79 °C | -0.69 °C | 0 mm |
| April | -1.89 °C | 9.13 °C | 29 mm |
| May | 4.93 °C | 16.93 °C | 96 mm |
| June | 11.43 °C | 22.6 °C | 124 mm |
| July | 13.84 °C | 25.34 °C | 96 mm |
| August | 12.84 °C | 24.76 °C | 81 mm |
| September | 8.09 °C | 19.76 °C | 46 mm |
| October | 1.74 °C | 10.97 °C | 46 mm |
| November | -6.83 °C | 0.71 °C | 0 mm |
| December | -17.34 °C | -9.82 °C | 0 mm |
| Annual | -2.1 °C | 8.2 °C | 518 mm |
| 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 : -37.2°C to -34.4°C |
| Current Drought Conditions | Normal |