Petty Harbour-Maddox Cove, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from 3.3 °C (low) to 7.7 °C (high). Annual precipitation averages 990 Millimeters. 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 | -4.61 °C | 0.26 °C | 69 mm |
| February | -5.31 °C | -0.73 °C | 68 mm |
| March | -3.97 °C | -0.02 °C | 61 mm |
| April | -0.8 °C | 3.1 °C | 72 mm |
| May | 2.84 °C | 7.03 °C | 78 mm |
| June | 6.81 °C | 11.3 °C | 68 mm |
| July | 12 °C | 16.86 °C | 80 mm |
| August | 13.7 °C | 18.2 °C | 75 mm |
| September | 10.94 °C | 15.55 °C | 96 mm |
| October | 7.12 °C | 10.94 °C | 110 mm |
| November | 2.85 °C | 6.89 °C | 107 mm |
| December | -1.46 °C | 2.86 °C | 106 mm |
| Annual | 3.3 °C | 7.7 °C | 990 mm |
| 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 : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |