L'Assomption, Quebec climate data is summarized below. Average annual temperatures range from 1.8 °C (low) to 11.3 °C (high). Annual precipitation averages 809 Millimeters. L'Assomption 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 | -14.28 °C | -5.5 °C | 6 mm |
| February | -13.54 °C | -4.54 °C | 8 mm |
| March | -7.65 °C | 2.04 °C | 26 mm |
| April | 1.06 °C | 11.34 °C | 75 mm |
| May | 8.14 °C | 19.3 °C | 83 mm |
| June | 13.46 °C | 23.82 °C | 128 mm |
| July | 16.04 °C | 26.27 °C | 130 mm |
| August | 15.09 °C | 25.3 °C | 106 mm |
| September | 10.18 °C | 20.83 °C | 74 mm |
| October | 4.4 °C | 13.08 °C | 93 mm |
| November | -1.59 °C | 5.79 °C | 56 mm |
| December | -9.59 °C | -2.52 °C | 24 mm |
| Annual | 1.8 °C | 11.3 °C | 809 mm |
| 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 : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |