Portneuf, Quebec climate data is summarized below. Average annual temperatures range from 0.4 °C (low) to 10.1 °C (high). Annual precipitation averages 985 Millimeters. Portneuf is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.95 °C | -6.29 °C | 0 mm |
| February | -15.15 °C | -5.24 °C | 0 mm |
| March | -9.64 °C | 0.29 °C | 18 mm |
| April | -0.79 °C | 9.18 °C | 76 mm |
| May | 6.25 °C | 18.16 °C | 96 mm |
| June | 11.64 °C | 22.59 °C | 135 mm |
| July | 14.4 °C | 25.09 °C | 174 mm |
| August | 13.8 °C | 24.28 °C | 146 mm |
| September | 8.84 °C | 19.51 °C | 121 mm |
| October | 3.65 °C | 12.08 °C | 127 mm |
| November | -2.04 °C | 4.91 °C | 74 mm |
| December | -10.62 °C | -3.37 °C | 18 mm |
| Annual | 0.4 °C | 10.1 °C | 985 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |