Longueuil, Quebec climate data is summarized below. Average annual temperatures range from 3.6 °C (low) to 12.1 °C (high). Annual precipitation averages 944 Millimeters. Longueuil is located in USDA Plant Hardiness Zone 6a. 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 | -11.45 °C | -4.08 °C | 16 mm |
| February | -11.2 °C | -3.6 °C | 21 mm |
| March | -5.29 °C | 3.14 °C | 55 mm |
| April | 2.45 °C | 12.13 °C | 106 mm |
| May | 9.44 °C | 19.69 °C | 96 mm |
| June | 14.58 °C | 24.13 °C | 107 mm |
| July | 17.32 °C | 26.66 °C | 135 mm |
| August | 16.55 °C | 25.86 °C | 110 mm |
| September | 11.81 °C | 21.38 °C | 72 mm |
| October | 5.96 °C | 13.84 °C | 107 mm |
| November | -0.18 °C | 6.81 °C | 74 mm |
| December | -7.29 °C | -1.24 °C | 45 mm |
| Annual | 3.6 °C | 12.1 °C | 944 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |