Beauharnois, Quebec climate data is summarized below. Average annual temperatures range from 37 °F (low) to 53.2 °F (high). Annual precipitation averages 22.4 Inches. Beauharnois 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 | -24.9 °F | -20.2 °F | 0 in. |
| February | -24.7 °F | -20 °F | 25.4 in. |
| March | -21.3 °F | -16.2 °F | 635 in. |
| April | -16.7 °F | -11.2 °F | 1625.6 in. |
| May | -13 °F | -7 °F | 1397 in. |
| June | -10.1 °F | -4.6 °F | 1828.8 in. |
| July | -8.6 °F | -3.2 °F | 2717.8 in. |
| August | -9.1 °F | -3.6 °F | 1803.4 in. |
| September | -11.7 °F | -6.1 °F | 1244.6 in. |
| October | -14.7 °F | -10.2 °F | 1778 in. |
| November | -18.1 °F | -14 °F | 1041.4 in. |
| December | -22.1 °F | -18.5 °F | 355.6 in. |
| Annual | 37 °F | 53.2 °F | 22.4 in. |
| 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 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |