Montmagny, Quebec climate data is summarized below. Average annual temperatures range from 1.9 °C (low) to 9.5 °C (high). Annual precipitation averages 681 Millimeters. 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 | -13.63 °C | -5.55 °C | 0 mm |
| February | -12.81 °C | -4.73 °C | 0 mm |
| March | -8.15 °C | -0.02 °C | 0 mm |
| April | 0.11 °C | 7.63 °C | 45 mm |
| May | 6.86 °C | 15.46 °C | 75 mm |
| June | 12.02 °C | 20.41 °C | 87 mm |
| July | 15.27 °C | 23.41 °C | 100 mm |
| August | 15.07 °C | 23.03 °C | 105 mm |
| September | 10.91 °C | 18.81 °C | 91 mm |
| October | 5.63 °C | 12.02 °C | 105 mm |
| November | 0.05 °C | 5.62 °C | 70 mm |
| December | -8.17 °C | -2.02 °C | 3 mm |
| Annual | 1.9 °C | 9.5 °C | 681 mm |
| 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 : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |