Cartwright, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from -2.6 °C (low) to 3.5 °C (high). Annual precipitation averages 539 Millimeters. Cartwright is located in USDA Plant Hardiness Zone 3a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.52 °C | -8.59 °C | 8 mm |
| February | -15.37 °C | -7.88 °C | 3 mm |
| March | -11.18 °C | -4.87 °C | 7 mm |
| April | -5.22 °C | -0.4 °C | 23 mm |
| May | -0.73 °C | 4.86 °C | 52 mm |
| June | 4.25 °C | 11.61 °C | 60 mm |
| July | 8.93 °C | 16.53 °C | 76 mm |
| August | 9.65 °C | 16.95 °C | 69 mm |
| September | 5.81 °C | 12.25 °C | 75 mm |
| October | 1.7 °C | 6 °C | 91 mm |
| November | -3.67 °C | 0.41 °C | 53 mm |
| December | -10.35 °C | -5.02 °C | 22 mm |
| Annual | -2.6 °C | 3.5 °C | 539 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3a : -40°C to -37.2°C |
| Current Drought Conditions | Abnormally Dry |