Saint-Hyacinthe, Quebec climate data is summarized below. Average annual temperatures range from 36.5 °F (low) to 53.6 °F (high). Annual precipitation averages 36.8 Inches. Saint-Hyacinthe 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 | -20.2 °F | 558.8 in. |
| February | -24.7 °F | -19.8 °F | 558.8 in. |
| March | -21.3 °F | -16 °F | 1219.2 in. |
| April | -16.9 °F | -11.1 °F | 2489.2 in. |
| May | -13.1 °F | -6.8 °F | 2616.2 in. |
| June | -10.2 °F | -4.4 °F | 2717.8 in. |
| July | -8.8 °F | -3 °F | 3022.6 in. |
| August | -9.3 °F | -3.5 °F | 2489.2 in. |
| September | -11.9 °F | -5.9 °F | 2032 in. |
| October | -15.1 °F | -10.1 °F | 2870.2 in. |
| November | -18.3 °F | -14.1 °F | 1879.6 in. |
| December | -22.3 °F | -18.5 °F | 1244.6 in. |
| Annual | 36.5 °F | 53.6 °F | 36.75 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 |