Rossburn, Manitoba climate data is summarized below. Average annual temperatures range from 25 °F (low) to 44.4 °F (high). Annual precipitation averages 17.3 Inches. 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 | -29.7 °F | -24.2 °F | 0 in. |
| February | -29.7 °F | -23.6 °F | 0 in. |
| March | -25.1 °F | -18.9 °F | 0 in. |
| April | -19.7 °F | -13.6 °F | 406.4 in. |
| May | -15.8 °F | -9.1 °F | 1625.6 in. |
| June | -12.4 °F | -6.2 °F | 3149.6 in. |
| July | -11.1 °F | -4.7 °F | 2184.4 in. |
| August | -12 °F | -5 °F | 1600.2 in. |
| September | -14.6 °F | -7.6 °F | 1092.2 in. |
| October | -17.9 °F | -12.5 °F | 1092.2 in. |
| November | -22.9 °F | -18.4 °F | 0 in. |
| December | -28.7 °F | -23.8 °F | 0 in. |
| Annual | 25 °F | 44.4 °F | 17.28 in. |
| 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°F to -35°F |
| Current Drought Conditions | Normal |