Eastmain, Quebec climate data is summarized below. Average annual temperatures range from -6.3 °C (low) to 4.7 °C (high). Annual precipitation averages 754 Millimeters. Eastmain is located in USDA Plant Hardiness Zone 1b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -26.2 °C | -14.53 °C | 0 mm |
| February | -26.48 °C | -13.37 °C | 0 mm |
| March | -21.19 °C | -6.38 °C | 0 mm |
| April | -10.32 °C | 1.41 °C | 18 mm |
| May | -0.07 °C | 12.3 °C | 79 mm |
| June | 6.68 °C | 20.39 °C | 80 mm |
| July | 9.57 °C | 21.4 °C | 168 mm |
| August | 9.87 °C | 20.59 °C | 163 mm |
| September | 6.03 °C | 15.43 °C | 117 mm |
| October | 1.38 °C | 8.25 °C | 111 mm |
| November | -5.86 °C | 0.13 °C | 18 mm |
| December | -19.52 °C | -9.79 °C | 0 mm |
| Annual | -6.3 °C | 4.7 °C | 754 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 1b : |
| Current Drought Conditions | Normal |