Roberval, Quebec climate data is summarized below. Average annual temperatures range from 29.4 °F (low) to 45 °F (high). Annual precipitation averages 28.7 Inches. Roberval is located in USDA Plant Hardiness Zone 3b. 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 | -28.5 °F | -23.5 °F | 0 in. |
| February | -27.9 °F | -22.8 °F | 0 in. |
| March | -24.7 °F | -19.3 °F | 0 in. |
| April | -19.4 °F | -14.5 °F | 1143 in. |
| May | -15.3 °F | -9.3 °F | 2184.4 in. |
| June | -12 °F | -6.6 °F | 2946.4 in. |
| July | -10.2 °F | -5.4 °F | 3556 in. |
| August | -10.4 °F | -5.8 °F | 2997.2 in. |
| September | -13.1 °F | -8.3 °F | 2489.2 in. |
| October | -16.2 °F | -12.4 °F | 2311.4 in. |
| November | -19.7 °F | -16.3 °F | 863.6 in. |
| December | -25.4 °F | -21.3 °F | 0 in. |
| Annual | 29.4 °F | 45 °F | 28.67 in. |
| 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 3b : -35°F to -30°F |
| Current Drought Conditions | Normal |