L'Assomption, Quebec climate data is summarized below. Average annual temperatures range from 35.3 °F (low) to 52.3 °F (high). Annual precipitation averages 31.8 Inches. 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 | -25.7 °F | -20.8 °F | 152.4 in. |
| February | -25.3 °F | -20.3 °F | 203.2 in. |
| March | -22 °F | -16.6 °F | 660.4 in. |
| April | -17.2 °F | -11.5 °F | 1905 in. |
| May | -13.3 °F | -7.1 °F | 2108.2 in. |
| June | -10.3 °F | -4.5 °F | 3251.2 in. |
| July | -8.9 °F | -3.2 °F | 3302 in. |
| August | -9.4 °F | -3.7 °F | 2692.4 in. |
| September | -12.1 °F | -6.2 °F | 1879.6 in. |
| October | -15.3 °F | -10.5 °F | 2362.2 in. |
| November | -18.7 °F | -14.6 °F | 1422.4 in. |
| December | -23.1 °F | -19.2 °F | 609.6 in. |
| Annual | 35.3 °F | 52.3 °F | 31.83 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 |