Matachewan, Ontario climate data is summarized below. Average annual temperatures range from 27.1 °F (low) to 46.1 °F (high). Annual precipitation averages 23.9 Inches. Matachewan is located in USDA Plant Hardiness Zone 3a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -28.8 °F | -23.1 °F | 0 in. |
| February | -29 °F | -22.7 °F | 0 in. |
| March | -24.9 °F | -18.5 °F | 0 in. |
| April | -20.3 °F | -14.3 °F | 1066.8 in. |
| May | -15.7 °F | -8.6 °F | 1879.6 in. |
| June | -12.6 °F | -5.7 °F | 1981.2 in. |
| July | -11.1 °F | -4.7 °F | 2616.2 in. |
| August | -11.4 °F | -5.3 °F | 2590.8 in. |
| September | -14.1 °F | -8 °F | 2235.2 in. |
| October | -17.1 °F | -12.4 °F | 2286 in. |
| November | -20.7 °F | -16.6 °F | 762 in. |
| December | -26.1 °F | -21.3 °F | 0 in. |
| Annual | 27.1 °F | 46.1 °F | 23.89 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3a : -40°F to -35°F |
| Current Drought Conditions | Normal |