Portneuf, Quebec climate data is summarized below. Average annual temperatures range from 32.7 °F (low) to 50.2 °F (high). Annual precipitation averages 38.8 Inches. 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 | -26.6 °F | -21.3 °F | 0 in. |
| February | -26.2 °F | -20.7 °F | 0 in. |
| March | -23.1 °F | -17.6 °F | 457.2 in. |
| April | -18.2 °F | -12.7 °F | 1930.4 in. |
| May | -14.3 °F | -7.7 °F | 2438.4 in. |
| June | -11.3 °F | -5.2 °F | 3429 in. |
| July | -9.8 °F | -3.8 °F | 4419.6 in. |
| August | -10.1 °F | -4.3 °F | 3708.4 in. |
| September | -12.9 °F | -6.9 °F | 3073.4 in. |
| October | -15.8 °F | -11.1 °F | 3225.8 in. |
| November | -18.9 °F | -15.1 °F | 1879.6 in. |
| December | -23.7 °F | -19.7 °F | 457.2 in. |
| Annual | 32.7 °F | 50.2 °F | 38.77 in. |
| 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 : -25°F to -20°F |
| Current Drought Conditions | Normal |