Rossburn, Manitoba climate data is summarized below. Average annual temperatures range from -3.9 °C (low) to 6.9 °C (high). Annual precipitation averages 439 Millimeters. Rossburn is located in USDA Plant Hardiness Zone 3a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -21.38 °C | -11.51 °C | 0 mm |
| February | -21.37 °C | -10.52 °C | 0 mm |
| March | -13.21 °C | -2.04 °C | 0 mm |
| April | -3.46 °C | 7.59 °C | 16 mm |
| May | 3.48 °C | 15.68 °C | 64 mm |
| June | 9.61 °C | 20.8 °C | 124 mm |
| July | 12.07 °C | 23.49 °C | 86 mm |
| August | 10.48 °C | 22.95 °C | 63 mm |
| September | 5.77 °C | 18.38 °C | 43 mm |
| October | -0.16 °C | 9.57 °C | 43 mm |
| November | -9.2 °C | -1.03 °C | 0 mm |
| December | -19.62 °C | -10.91 °C | 0 mm |
| Annual | -3.9 °C | 6.9 °C | 439 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3a : -40°C to -37.2°C |
| Current Drought Conditions | Normal |