Montmagny, Quebec climate data is summarized below. Average annual temperatures range from 35.5 °F (low) to 49.1 °F (high). Annual precipitation averages 26.8 Inches. Montmagny 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 | -25.4 °F | -20.9 °F | 0 in. |
| February | -24.9 °F | -20.4 °F | 0 in. |
| March | -22.3 °F | -17.8 °F | 0 in. |
| April | -17.7 °F | -13.5 °F | 1143 in. |
| May | -14 °F | -9.2 °F | 1905 in. |
| June | -11.1 °F | -6.4 °F | 2209.8 in. |
| July | -9.3 °F | -4.8 °F | 2540 in. |
| August | -9.4 °F | -5 °F | 2667 in. |
| September | -11.7 °F | -7.3 °F | 2311.4 in. |
| October | -14.7 °F | -11.1 °F | 2667 in. |
| November | -17.8 °F | -14.7 °F | 1778 in. |
| December | -22.3 °F | -18.9 °F | 76.2 in. |
| Annual | 35.5 °F | 49.1 °F | 26.81 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 |