Sainte-Justine, Quebec climate data is summarized below. Average annual temperatures range from 29.5 °F (low) to 47.6 °F (high). Annual precipitation averages 7.9 Inches. 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 | -27 °F | -21.6 °F | 0 in. |
| February | -26.7 °F | -21.1 °F | 0 in. |
| March | -24 °F | -18.1 °F | 0 in. |
| April | -19.6 °F | -14 °F | 203.2 in. |
| May | -15.5 °F | -8.9 °F | 533.4 in. |
| June | -12.5 °F | -6.4 °F | 812.8 in. |
| July | -10.8 °F | -4.8 °F | 1270 in. |
| August | -11.3 °F | -5.2 °F | 965.2 in. |
| September | -13.9 °F | -7.8 °F | 457.2 in. |
| October | -16.8 °F | -11.9 °F | 482.6 in. |
| November | -20.1 °F | -15.8 °F | 355.6 in. |
| December | -24.5 °F | -20.1 °F | 0 in. |
| Annual | 29.5 °F | 47.6 °F | 7.88 in. |
| 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 : -30°F to -25°F |
| Current Drought Conditions | Abnormally Dry |