Cook's Harbour, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from -0.1 °C (low) to 3.9 °C (high). Annual precipitation averages 632 Millimeters. Cook's Harbour is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.34 °C | -4.79 °C | 15 mm |
| February | -10.54 °C | -4.75 °C | 11 mm |
| March | -7.69 °C | -2.92 °C | 23 mm |
| April | -3.14 °C | 0.11 °C | 40 mm |
| May | 0.33 °C | 3.45 °C | 57 mm |
| June | 4.82 °C | 8.42 °C | 57 mm |
| July | 9.52 °C | 13.49 °C | 65 mm |
| August | 11.21 °C | 14.93 °C | 64 mm |
| September | 8.06 °C | 11.64 °C | 81 mm |
| October | 3.7 °C | 6.7 °C | 91 mm |
| November | -1.21 °C | 2.27 °C | 73 mm |
| December | -6.49 °C | -2.13 °C | 55 mm |
| Annual | -0.1 °C | 3.9 °C | 632 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Normal |