Westbourne, Manitoba climate data is summarized below. Average annual temperatures range from 28.6 °F (low) to 47.2 °F (high). Annual precipitation averages 18.7 Inches. Westbourne is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -28.9 °F | -23.6 °F | 0 in. |
| February | -28.6 °F | -22.9 °F | 0 in. |
| March | -23.6 °F | -18.1 °F | 25.4 in. |
| April | -18.7 °F | -12.8 °F | 584.2 in. |
| May | -15 °F | -8.5 °F | 2286 in. |
| June | -11.4 °F | -5.4 °F | 2819.4 in. |
| July | -10 °F | -3.8 °F | 2286 in. |
| August | -10.6 °F | -4 °F | 1879.6 in. |
| September | -13.3 °F | -6.7 °F | 1092.2 in. |
| October | -16.9 °F | -11.4 °F | 1092.2 in. |
| November | -21.6 °F | -17.2 °F | 0 in. |
| December | -27.4 °F | -23 °F | 0 in. |
| Annual | 28.6 °F | 47.2 °F | 18.69 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Normal |