Sault Ste. Marie, Ontario climate data is summarized below. Average annual temperatures range from 0.9 °C (low) to 10.2 °C (high). Annual precipitation averages 561 Millimeters. Sault Ste. Marie is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.96 °C | -4.96 °C | 0 mm |
| February | -13.98 °C | -4.88 °C | 0 mm |
| March | -8.09 °C | 1.47 °C | 11 mm |
| April | -1 °C | 8.37 °C | 34 mm |
| May | 5.57 °C | 16.97 °C | 53 mm |
| June | 10.52 °C | 22.2 °C | 79 mm |
| July | 13.23 °C | 24.34 °C | 84 mm |
| August | 13.69 °C | 23.97 °C | 77 mm |
| September | 9.42 °C | 19.44 °C | 90 mm |
| October | 4.4 °C | 12.25 °C | 81 mm |
| November | -1 °C | 5.37 °C | 41 mm |
| December | -8.58 °C | -1.79 °C | 11 mm |
| Annual | 0.9 °C | 10.2 °C | 561 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |