Sillery, Quebec climate data is summarized below. Average annual temperatures range from 1.1 °C (low) to 10.3 °C (high). Annual precipitation averages 923 Millimeters. Sillery is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.68 °C | -5.92 °C | 0 mm |
| February | -14.02 °C | -4.88 °C | 0 mm |
| March | -8.88 °C | 0.79 °C | 18 mm |
| April | -0.23 °C | 9.53 °C | 73 mm |
| May | 6.8 °C | 17.86 °C | 94 mm |
| June | 12.12 °C | 22.6 °C | 126 mm |
| July | 15.29 °C | 25.41 °C | 156 mm |
| August | 14.54 °C | 24.39 °C | 133 mm |
| September | 9.68 °C | 19.53 °C | 108 mm |
| October | 4.15 °C | 11.9 °C | 119 mm |
| November | -1.65 °C | 5.03 °C | 77 mm |
| December | -9.79 °C | -3.08 °C | 19 mm |
| Annual | 1.1 °C | 10.3 °C | 923 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |