Saint-Constant, Quebec climate data is summarized below. Average annual temperatures range from 3.2 °C (low) to 12.1 °C (high). Annual precipitation averages 891 Millimeters. Saint-Constant is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.95 °C | -4.03 °C | 16 mm |
| February | -11.62 °C | -3.67 °C | 21 mm |
| March | -5.68 °C | 3.29 °C | 58 mm |
| April | 2.15 °C | 12.17 °C | 105 mm |
| May | 8.97 °C | 19.8 °C | 91 mm |
| June | 14.2 °C | 24.14 °C | 92 mm |
| July | 16.89 °C | 26.9 °C | 121 mm |
| August | 16.09 °C | 26.01 °C | 87 mm |
| September | 11.29 °C | 21.46 °C | 68 mm |
| October | 5.63 °C | 13.79 °C | 109 mm |
| November | -0.51 °C | 6.82 °C | 72 mm |
| December | -7.32 °C | -1.11 °C | 51 mm |
| Annual | 3.2 °C | 12.1 °C | 891 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |