Bromont, Quebec climate data is summarized below. Average annual temperatures range from 2 °C (low) to 11.7 °C (high). Annual precipitation averages 410 Millimeters. Bromont 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 | -12.75 °C | -3.85 °C | 4 mm |
| February | -12.63 °C | -3.63 °C | 0 mm |
| March | -6.95 °C | 2.6 °C | 15 mm |
| April | 1.01 °C | 11.54 °C | 42 mm |
| May | 7.7 °C | 19.13 °C | 50 mm |
| June | 12.73 °C | 23.33 °C | 56 mm |
| July | 15.36 °C | 26.01 °C | 73 mm |
| August | 14.54 °C | 25.04 °C | 55 mm |
| September | 9.96 °C | 20.67 °C | 33 mm |
| October | 4.55 °C | 13.45 °C | 42 mm |
| November | -1.26 °C | 6.58 °C | 27 mm |
| December | -8.12 °C | -0.92 °C | 13 mm |
| Annual | 2 °C | 11.7 °C | 410 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 |