Mercier, Quebec climate data is summarized below. Average annual temperatures range from 3 °C (low) to 11.9 °C (high). Annual precipitation averages 544 Millimeters. Mercier is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.31 °C | -4.19 °C | 1 mm |
| February | -11.93 °C | -3.82 °C | 2 mm |
| March | -5.86 °C | 3.14 °C | 25 mm |
| April | 2.1 °C | 11.86 °C | 62 mm |
| May | 8.72 °C | 19.51 °C | 53 mm |
| June | 13.96 °C | 23.81 °C | 68 mm |
| July | 16.64 °C | 26.47 °C | 98 mm |
| August | 15.8 °C | 25.64 °C | 72 mm |
| September | 11.02 °C | 21.25 °C | 44 mm |
| October | 5.47 °C | 13.67 °C | 66 mm |
| November | -0.55 °C | 6.71 °C | 39 mm |
| December | -7.45 °C | -1.19 °C | 14 mm |
| Annual | 3 °C | 11.9 °C | 544 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |