Ashern, Manitoba climate data is summarized below. Average annual temperatures range from 26.4 °F (low) to 45.7 °F (high). Annual precipitation averages 20.3 Inches. Ashern is located in USDA Plant Hardiness Zone 3a. 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 | -30.3 °F | -24.6 °F | 0 in. |
| February | -30.3 °F | -23.6 °F | 0 in. |
| March | -25.3 °F | -18.6 °F | 0 in. |
| April | -19.6 °F | -13 °F | 584.2 in. |
| May | -15.4 °F | -8.6 °F | 2133.6 in. |
| June | -11.8 °F | -5.3 °F | 3302 in. |
| July | -10.2 °F | -3.8 °F | 2133.6 in. |
| August | -10.7 °F | -4.3 °F | 2616.2 in. |
| September | -13.4 °F | -7.2 °F | 1143 in. |
| October | -16.9 °F | -12 °F | 1168.4 in. |
| November | -21.8 °F | -17.9 °F | 0 in. |
| December | -28.6 °F | -23.7 °F | 0 in. |
| Annual | 26.4 °F | 45.7 °F | 20.29 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 3a : -40°F to -35°F |
| Current Drought Conditions | Normal |