Granby, Quebec climate data is summarized below. Average annual temperatures range from 35.8 °F (low) to 53.5 °F (high). Annual precipitation averages 18.9 Inches. 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 | -24.9 °F | -19.9 °F | 203.2 in. |
| February | -24.8 °F | -19.8 °F | 152.4 in. |
| March | -21.6 °F | -16.1 °F | 533.4 in. |
| April | -17.2 °F | -11.1 °F | 1295.4 in. |
| May | -13.4 °F | -6.9 °F | 1371.6 in. |
| June | -10.6 °F | -4.6 °F | 1676.4 in. |
| July | -9.1 °F | -3.1 °F | 1981.2 in. |
| August | -9.6 °F | -3.6 °F | 1498.6 in. |
| September | -12.2 °F | -6.1 °F | 965.2 in. |
| October | -15.2 °F | -10.2 °F | 1270 in. |
| November | -18.4 °F | -14 °F | 838.2 in. |
| December | -22.3 °F | -18.3 °F | 406.4 in. |
| Annual | 35.8 °F | 53.5 °F | 18.91 in. |
| 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 : -15°F to -10°F |
| Current Drought Conditions | Normal |