Mistissini, Quebec climate data is summarized below. Average annual temperatures range from -5.5 °C (low) to 4.5 °C (high). Annual precipitation averages 691 Millimeters. Mistissini is located in USDA Plant Hardiness Zone 2a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -25.41 °C | -13.89 °C | 0 mm |
| February | -24.9 °C | -12.14 °C | 0 mm |
| March | -19.42 °C | -5.82 °C | 0 mm |
| April | -8.79 °C | 1.73 °C | 27 mm |
| May | 0.62 °C | 11.88 °C | 93 mm |
| June | 8.29 °C | 19.37 °C | 116 mm |
| July | 11.01 °C | 20.92 °C | 117 mm |
| August | 10.64 °C | 19.96 °C | 116 mm |
| September | 6.15 °C | 14.9 °C | 108 mm |
| October | 1.21 °C | 7.36 °C | 96 mm |
| November | -6.31 °C | -0.64 °C | 18 mm |
| December | -19.13 °C | -9.46 °C | 0 mm |
| Annual | -5.5 °C | 4.5 °C | 691 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 2a : -45.6°C to -42.8°C |
| Current Drought Conditions | Normal |