Granby, Quebec climate data is summarized below. Average annual temperatures range from 2.1 °C (low) to 11.9 °C (high). Annual precipitation averages 480 Millimeters. Granby 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 | -12.79 °C | -3.89 °C | 8 mm |
| February | -12.65 °C | -3.55 °C | 6 mm |
| March | -6.84 °C | 3.08 °C | 21 mm |
| April | 1.13 °C | 11.94 °C | 51 mm |
| May | 7.93 °C | 19.54 °C | 54 mm |
| June | 13.01 °C | 23.75 °C | 66 mm |
| July | 15.6 °C | 26.4 °C | 78 mm |
| August | 14.75 °C | 25.46 °C | 59 mm |
| September | 10.05 °C | 21.05 °C | 38 mm |
| October | 4.65 °C | 13.68 °C | 50 mm |
| November | -1.16 °C | 6.76 °C | 33 mm |
| December | -8.15 °C | -0.96 °C | 16 mm |
| Annual | 2.1 °C | 11.9 °C | 480 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 |