Red Harbour, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from 37.2 °F (low) to 46.9 °F (high). Annual precipitation averages 51.2 Inches. 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 | -21 °F | -18 °F | 2235.2 in. |
| February | -21.6 °F | -18.6 °F | 1981.2 in. |
| March | -20.6 °F | -17.8 °F | 1955.8 in. |
| April | -18.4 °F | -15.4 °F | 2336.8 in. |
| May | -16 °F | -12.6 °F | 2463.8 in. |
| June | -13.7 °F | -10.3 °F | 2514.6 in. |
| July | -11 °F | -7.8 °F | 2743.2 in. |
| August | -10.2 °F | -6.9 °F | 2895.6 in. |
| September | -11.8 °F | -8.6 °F | 3327.4 in. |
| October | -14.2 °F | -11.5 °F | 3733.8 in. |
| November | -16.6 °F | -14 °F | 3733.8 in. |
| December | -19.1 °F | -16.4 °F | 3124.2 in. |
| Annual | 37.2 °F | 46.9 °F | 51.22 in. |
| 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 : -15°F to -10°F |
| Current Drought Conditions | Normal |