Mistissini, Quebec climate data is summarized below. Average annual temperatures range from 22.1 °F (low) to 40.1 °F (high). Annual precipitation averages 27.2 Inches. 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 | -31.9 °F | -25.5 °F | 0 in. |
| February | -31.6 °F | -24.5 °F | 0 in. |
| March | -28.6 °F | -21 °F | 0 in. |
| April | -22.7 °F | -16.8 °F | 685.8 in. |
| May | -17.4 °F | -11.2 °F | 2362.2 in. |
| June | -13.2 °F | -7 °F | 2946.4 in. |
| July | -11.7 °F | -6.2 °F | 2971.8 in. |
| August | -11.9 °F | -6.7 °F | 2946.4 in. |
| September | -14.4 °F | -9.5 °F | 2743.2 in. |
| October | -17.1 °F | -13.7 °F | 2438.4 in. |
| November | -21.3 °F | -18.1 °F | 457.2 in. |
| December | -28.4 °F | -23 °F | 0 in. |
| Annual | 22.1 °F | 40.1 °F | 27.21 in. |
| 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 : -50°F to -45°F |
| Current Drought Conditions | Normal |