Corner Brook, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from -0.2 °C (low) to 6.5 °C (high). Annual precipitation averages 858 Millimeters. Corner Brook is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.45 °C | -4.35 °C | 22 mm |
| February | -11.2 °C | -4.7 °C | 11 mm |
| March | -9.5 °C | -2.79 °C | 31 mm |
| April | -3.84 °C | 2.34 °C | 53 mm |
| May | 1.03 °C | 9.06 °C | 76 mm |
| June | 6.08 °C | 14.71 °C | 69 mm |
| July | 10.68 °C | 19.48 °C | 93 mm |
| August | 11.14 °C | 19.2 °C | 110 mm |
| September | 7.63 °C | 14.64 °C | 121 mm |
| October | 3.26 °C | 8.57 °C | 114 mm |
| November | -1.25 °C | 3.45 °C | 100 mm |
| December | -6.44 °C | -1.43 °C | 58 mm |
| Annual | -0.2 °C | 6.5 °C | 858 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |