Corner Brook, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from 31.6 °F (low) to 43.7 °F (high). Annual precipitation averages 33.8 Inches. 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 | -23.6 °F | -20.2 °F | 558.8 in. |
| February | -24 °F | -20.4 °F | 279.4 in. |
| March | -23.1 °F | -19.3 °F | 787.4 in. |
| April | -19.9 °F | -16.5 °F | 1346.2 in. |
| May | -17.2 °F | -12.7 °F | 1930.4 in. |
| June | -14.4 °F | -9.6 °F | 1752.6 in. |
| July | -11.8 °F | -7 °F | 2362.2 in. |
| August | -11.6 °F | -7.1 °F | 2794 in. |
| September | -13.5 °F | -9.6 °F | 3073.4 in. |
| October | -16 °F | -13 °F | 2895.6 in. |
| November | -18.5 °F | -15.9 °F | 2540 in. |
| December | -21.4 °F | -18.6 °F | 1473.2 in. |
| Annual | 31.6 °F | 43.7 °F | 33.78 in. |
| 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 : -20°F to -15°F |
| Current Drought Conditions | Normal |