Petty Harbour-Maddox Cove, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from 38 °F (low) to 45.8 °F (high). Annual precipitation averages 39 Inches. Petty Harbour-Maddox Cove is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -20.3 °F | -17.6 °F | 1752.6 in. |
| February | -20.7 °F | -18.2 °F | 1727.2 in. |
| March | -20 °F | -17.8 °F | 1549.4 in. |
| April | -18.2 °F | -16.1 °F | 1828.8 in. |
| May | -16.2 °F | -13.9 °F | 1981.2 in. |
| June | -14 °F | -11.5 °F | 1727.2 in. |
| July | -11.1 °F | -8.4 °F | 2032 in. |
| August | -10.2 °F | -7.7 °F | 1905 in. |
| September | -11.7 °F | -9.1 °F | 2438.4 in. |
| October | -13.8 °F | -11.7 °F | 2794 in. |
| November | -16.2 °F | -14 °F | 2717.8 in. |
| December | -18.6 °F | -16.2 °F | 2692.4 in. |
| Annual | 38 °F | 45.8 °F | 38.97 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |