Long Harbour-Mount Arlington Heights, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from 2.7 °C (low) to 8.5 °C (high). Annual precipitation averages 1050 Millimeters. Long Harbour-Mount Arlington Heights is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.06 °C | -0.17 °C | 71 mm |
| February | -6.98 °C | -1.25 °C | 72 mm |
| March | -5.08 °C | 0.02 °C | 68 mm |
| April | -1.22 °C | 4.32 °C | 78 mm |
| May | 2.88 °C | 9.32 °C | 82 mm |
| June | 6.98 °C | 13.73 °C | 72 mm |
| July | 12.03 °C | 18.8 °C | 78 mm |
| August | 13.36 °C | 19.77 °C | 82 mm |
| September | 10.22 °C | 16.57 °C | 106 mm |
| October | 6.21 °C | 11.33 °C | 121 mm |
| November | 1.96 °C | 6.88 °C | 116 mm |
| December | -2.52 °C | 2.54 °C | 104 mm |
| Annual | 2.7 °C | 8.5 °C | 1050 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |