Westmount, Quebec climate data is summarized below. Average annual temperatures range from 3.7 °C (low) to 11.9 °C (high). Annual precipitation averages 946 Millimeters. Westmount is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.43 °C | -4.11 °C | 16 mm |
| February | -11.18 °C | -3.72 °C | 19 mm |
| March | -5.21 °C | 3.04 °C | 57 mm |
| April | 2.57 °C | 11.93 °C | 108 mm |
| May | 9.46 °C | 19.52 °C | 91 mm |
| June | 14.57 °C | 23.86 °C | 103 mm |
| July | 17.35 °C | 26.55 °C | 135 mm |
| August | 16.68 °C | 25.7 °C | 108 mm |
| September | 11.97 °C | 21.21 °C | 72 mm |
| October | 6.09 °C | 13.59 °C | 111 mm |
| November | -0.02 °C | 6.65 °C | 76 mm |
| December | -7.13 °C | -1.22 °C | 50 mm |
| Annual | 3.7 °C | 11.9 °C | 946 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |