Châteauguay, Quebec climate data is summarized below. Average annual temperatures range from 3.4 °C (low) to 12 °C (high). Annual precipitation averages 690 Millimeters. Châteauguay is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.93 °C | -4.12 °C | 8 mm |
| February | -11.54 °C | -3.75 °C | 11 mm |
| March | -5.5 °C | 3.25 °C | 41 mm |
| April | 2.4 °C | 11.97 °C | 82 mm |
| May | 9.13 °C | 19.59 °C | 68 mm |
| June | 14.3 °C | 23.9 °C | 78 mm |
| July | 17.06 °C | 26.61 °C | 102 mm |
| August | 16.32 °C | 25.8 °C | 78 mm |
| September | 11.53 °C | 21.34 °C | 54 mm |
| October | 5.86 °C | 13.74 °C | 84 mm |
| November | -0.27 °C | 6.8 °C | 55 mm |
| December | -7.21 °C | -1.14 °C | 29 mm |
| Annual | 3.4 °C | 12 °C | 690 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |