Sault Ste. Marie, Ontario climate data is summarized below. Average annual temperatures range from 33.7 °F (low) to 50.4 °F (high). Annual precipitation averages 22.1 Inches. 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 | -25 °F | -20.5 °F | 0 in. |
| February | -25.5 °F | -20.5 °F | 0 in. |
| March | -22.3 °F | -17 °F | 279.4 in. |
| April | -18.3 °F | -13.1 °F | 863.6 in. |
| May | -14.7 °F | -8.4 °F | 1346.2 in. |
| June | -11.9 °F | -5.4 °F | 2006.6 in. |
| July | -10.4 °F | -4.3 °F | 2133.6 in. |
| August | -10.2 °F | -4.5 °F | 1955.8 in. |
| September | -12.5 °F | -7 °F | 2286 in. |
| October | -15.3 °F | -11 °F | 2057.4 in. |
| November | -18.3 °F | -14.8 °F | 1041.4 in. |
| December | -22.5 °F | -18.8 °F | 279.4 in. |
| Annual | 33.7 °F | 50.4 °F | 22.08 in. |
| 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 : -25°F to -20°F |
| Current Drought Conditions | Normal |