Beauharnois, Quebec climate data is summarized below. Average annual temperatures range from 2.8 °C (low) to 11.8 °C (high). Annual precipitation averages 569 Millimeters. 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 | -12.8 °C | -4.38 °C | 0 mm |
| February | -12.45 °C | -4.02 °C | 1 mm |
| March | -6.37 °C | 2.78 °C | 25 mm |
| April | 1.99 °C | 11.77 °C | 64 mm |
| May | 8.62 °C | 19.39 °C | 55 mm |
| June | 13.88 °C | 23.73 °C | 72 mm |
| July | 16.57 °C | 26.32 °C | 107 mm |
| August | 15.68 °C | 25.46 °C | 71 mm |
| September | 10.97 °C | 21.1 °C | 49 mm |
| October | 5.49 °C | 13.7 °C | 70 mm |
| November | -0.58 °C | 6.74 °C | 41 mm |
| December | -7.75 °C | -1.31 °C | 14 mm |
| Annual | 2.8 °C | 11.8 °C | 569 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |