Saint-Eustache, Quebec climate data is summarized below. Average annual temperatures range from 2.8 °C (low) to 11.6 °C (high). Annual precipitation averages 839 Millimeters. Saint-Eustache is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.98 °C | -4.93 °C | 9 mm |
| February | -12.66 °C | -4.29 °C | 11 mm |
| March | -6.5 °C | 2.46 °C | 40 mm |
| April | 1.88 °C | 11.46 °C | 90 mm |
| May | 8.94 °C | 19.55 °C | 83 mm |
| June | 14.12 °C | 23.98 °C | 111 mm |
| July | 16.82 °C | 26.46 °C | 142 mm |
| August | 16.1 °C | 25.63 °C | 95 mm |
| September | 11.25 °C | 21.16 °C | 70 mm |
| October | 5.41 °C | 13.45 °C | 103 mm |
| November | -0.78 °C | 6.23 °C | 58 mm |
| December | -8.36 °C | -1.85 °C | 27 mm |
| Annual | 2.8 °C | 11.6 °C | 839 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |