Port-Cartier, Quebec climate data is summarized below. Average annual temperatures range from -1.5 °C (low) to 5.9 °C (high). Annual precipitation averages 812 Millimeters. Port-Cartier is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -17.11 °C | -8.26 °C | 0 mm |
| February | -16.54 °C | -6.95 °C | 0 mm |
| March | -13.25 °C | -3 °C | 0 mm |
| April | -4.11 °C | 2.35 °C | 55 mm |
| May | 2.62 °C | 9.45 °C | 109 mm |
| June | 9.17 °C | 16.25 °C | 88 mm |
| July | 12.74 °C | 19.59 °C | 105 mm |
| August | 12.8 °C | 19.6 °C | 98 mm |
| September | 7.9 °C | 15.23 °C | 113 mm |
| October | 3.04 °C | 9 °C | 127 mm |
| November | -3.09 °C | 2.44 °C | 93 mm |
| December | -11.7 °C | -4.58 °C | 24 mm |
| Annual | -1.5 °C | 5.9 °C | 812 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |