Sillery, Quebec climate data is summarized below. Average annual temperatures range from 34 °F (low) to 50.5 °F (high). Annual precipitation averages 36.3 Inches. 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 | -25.9 °F | -21.1 °F | 0 in. |
| February | -25.6 °F | -20.5 °F | 0 in. |
| March | -22.7 °F | -17.3 °F | 457.2 in. |
| April | -17.9 °F | -12.5 °F | 1854.2 in. |
| May | -14 °F | -7.9 °F | 2387.6 in. |
| June | -11 °F | -5.2 °F | 3200.4 in. |
| July | -9.3 °F | -3.7 °F | 3962.4 in. |
| August | -9.7 °F | -4.2 °F | 3378.2 in. |
| September | -12.4 °F | -6.9 °F | 2743.2 in. |
| October | -15.5 °F | -11.2 °F | 3022.6 in. |
| November | -18.7 °F | -15 °F | 1955.8 in. |
| December | -23.2 °F | -19.5 °F | 482.6 in. |
| Annual | 34 °F | 50.5 °F | 36.34 in. |
| 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 : -20°F to -15°F |
| Current Drought Conditions | Normal |