Mont-Saint-Hilaire, Quebec climate data is summarized below. Average annual temperatures range from 2.9 °C (low) to 11.9 °C (high). Annual precipitation averages 946 Millimeters. Mont-Saint-Hilaire 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 | -12.21 °C | -4.26 °C | 22 mm |
| February | -11.85 °C | -3.74 °C | 23 mm |
| March | -6.05 °C | 3 °C | 53 mm |
| April | 1.91 °C | 11.93 °C | 102 mm |
| May | 8.81 °C | 19.57 °C | 103 mm |
| June | 14.04 °C | 23.93 °C | 112 mm |
| July | 16.63 °C | 26.48 °C | 127 mm |
| August | 15.8 °C | 25.59 °C | 97 mm |
| September | 11.08 °C | 21.18 °C | 75 mm |
| October | 5.27 °C | 13.66 °C | 112 mm |
| November | -0.64 °C | 6.61 °C | 73 mm |
| December | -7.92 °C | -1.39 °C | 47 mm |
| Annual | 2.9 °C | 11.9 °C | 946 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |