Red Harbour, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from 2.9 °C (low) to 8.3 °C (high). Annual precipitation averages 1301 Millimeters. Red Harbour is located in USDA Plant Hardiness Zone 5b. 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 | -5.79 °C | -0.39 °C | 88 mm |
| February | -6.84 °C | -1.5 °C | 78 mm |
| March | -5.01 °C | -0.05 °C | 77 mm |
| April | -1.09 °C | 4.21 °C | 92 mm |
| May | 3.21 °C | 9.3 °C | 97 mm |
| June | 7.43 °C | 13.45 °C | 99 mm |
| July | 12.28 °C | 17.99 °C | 108 mm |
| August | 13.73 °C | 19.55 °C | 114 mm |
| September | 10.69 °C | 16.46 °C | 131 mm |
| October | 6.49 °C | 11.3 °C | 147 mm |
| November | 2.13 °C | 6.8 °C | 147 mm |
| December | -2.35 °C | 2.54 °C | 123 mm |
| Annual | 2.9 °C | 8.3 °C | 1301 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |