Ashern, Manitoba climate data is summarized below. Average annual temperatures range from -3.1 °C (low) to 7.6 °C (high). Annual precipitation averages 515 Millimeters. 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 | -22.47 °C | -12.21 °C | 0 mm |
| February | -22.45 °C | -10.48 °C | 0 mm |
| March | -13.52 °C | -1.42 °C | 0 mm |
| April | -3.29 °C | 8.64 °C | 23 mm |
| May | 4.23 °C | 16.55 °C | 84 mm |
| June | 10.79 °C | 22.42 °C | 130 mm |
| July | 13.69 °C | 25.09 °C | 84 mm |
| August | 12.79 °C | 24.21 °C | 103 mm |
| September | 7.89 °C | 18.99 °C | 45 mm |
| October | 1.6 °C | 10.45 °C | 46 mm |
| November | -7.18 °C | -0.14 °C | 0 mm |
| December | -19.4 °C | -10.62 °C | 0 mm |
| Annual | -3.1 °C | 7.6 °C | 515 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 3a : -40°C to -37.2°C |
| Current Drought Conditions | Normal |