Treherne, Manitoba climate data is summarized below. Average annual temperatures range from -1.6 °C (low) to 8.4 °C (high). Annual precipitation averages 417 Millimeters. Treherne is located in USDA Plant Hardiness Zone 4a. 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 | -19.13 °C | -10.14 °C | 0 mm |
| February | -18.37 °C | -8.93 °C | 0 mm |
| March | -9.32 °C | -0.01 °C | 5 mm |
| April | -1.23 °C | 9.09 °C | 14 mm |
| May | 5.2 °C | 16.56 °C | 49 mm |
| June | 11.4 °C | 22.01 °C | 92 mm |
| July | 13.89 °C | 24.7 °C | 105 mm |
| August | 12.89 °C | 24.61 °C | 104 mm |
| September | 8.02 °C | 19.93 °C | 32 mm |
| October | 1.62 °C | 11.41 °C | 14 mm |
| November | -6.84 °C | 1.12 °C | 2 mm |
| December | -16.88 °C | -9.14 °C | 0 mm |
| Annual | -1.6 °C | 8.4 °C | 417 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 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |