Saint-Jean-sur-Richelieu, Quebec climate data is summarized below. Average annual temperatures range from 2.9 °C (low) to 12.1 °C (high). Annual precipitation averages 581 Millimeters. Saint-Jean-sur-Richelieu is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.09 °C | -3.77 °C | 14 mm |
| February | -11.76 °C | -3.38 °C | 12 mm |
| March | -5.76 °C | 3.38 °C | 37 mm |
| April | 1.97 °C | 12.04 °C | 71 mm |
| May | 8.67 °C | 19.75 °C | 62 mm |
| June | 13.81 °C | 24.04 °C | 69 mm |
| July | 16.27 °C | 26.76 °C | 85 mm |
| August | 15.38 °C | 25.77 °C | 53 mm |
| September | 10.69 °C | 21.21 °C | 41 mm |
| October | 5.22 °C | 13.79 °C | 66 mm |
| November | -0.46 °C | 6.88 °C | 44 mm |
| December | -7.47 °C | -0.84 °C | 27 mm |
| Annual | 2.9 °C | 12.1 °C | 581 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |