Sainte-Justine, Quebec climate data is summarized below. Average annual temperatures range from -1.4 °C (low) to 8.6 °C (high). Annual precipitation averages 200 Millimeters. Sainte-Justine is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -16.57 °C | -6.87 °C | 0 mm |
| February | -16.05 °C | -6.01 °C | 0 mm |
| March | -11.21 °C | -0.61 °C | 0 mm |
| April | -3.19 °C | 6.79 °C | 8 mm |
| May | 4.03 °C | 15.94 °C | 21 mm |
| June | 9.43 °C | 20.55 °C | 32 mm |
| July | 12.52 °C | 23.43 °C | 50 mm |
| August | 11.58 °C | 22.61 °C | 38 mm |
| September | 6.92 °C | 18.02 °C | 18 mm |
| October | 1.77 °C | 10.53 °C | 19 mm |
| November | -4.13 °C | 3.51 °C | 14 mm |
| December | -12.07 °C | -4.12 °C | 0 mm |
| Annual | -1.4 °C | 8.6 °C | 200 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |