Treherne, Manitoba climate data is summarized below. Average annual temperatures range from 29.2 °F (low) to 47.2 °F (high). Annual precipitation averages 16.4 Inches. 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 | -28.4 °F | -23.4 °F | 0 in. |
| February | -28 °F | -22.7 °F | 0 in. |
| March | -23 °F | -17.8 °F | 127 in. |
| April | -18.5 °F | -12.7 °F | 355.6 in. |
| May | -14.9 °F | -8.6 °F | 1244.6 in. |
| June | -11.4 °F | -5.6 °F | 2336.8 in. |
| July | -10.1 °F | -4.1 °F | 2667 in. |
| August | -10.6 °F | -4.1 °F | 2641.6 in. |
| September | -13.3 °F | -6.7 °F | 812.8 in. |
| October | -16.9 °F | -11.4 °F | 355.6 in. |
| November | -21.6 °F | -17.2 °F | 50.8 in. |
| December | -27.2 °F | -22.9 °F | 0 in. |
| Annual | 29.2 °F | 47.2 °F | 16.41 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 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |