Matachewan, Ontario climate data is summarized below. Average annual temperatures range from -2.8 °C (low) to 7.8 °C (high). Annual precipitation averages 607 Millimeters. 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 | -19.87 °C | -9.62 °C | 0 mm |
| February | -20.13 °C | -8.84 °C | 0 mm |
| March | -12.86 °C | -1.28 °C | 0 mm |
| April | -4.55 °C | 6.28 °C | 42 mm |
| May | 3.67 °C | 16.51 °C | 74 mm |
| June | 9.27 °C | 21.73 °C | 78 mm |
| July | 12.1 °C | 23.55 °C | 103 mm |
| August | 11.5 °C | 22.55 °C | 102 mm |
| September | 6.66 °C | 17.63 °C | 88 mm |
| October | 1.29 °C | 9.63 °C | 90 mm |
| November | -5.17 °C | 2.17 °C | 30 mm |
| December | -14.91 °C | -6.4 °C | 0 mm |
| Annual | -2.8 °C | 7.8 °C | 607 mm |
| 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°C to -37.2°C |
| Current Drought Conditions | Normal |