Cartwright, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from 27.3 °F (low) to 38.3 °F (high). Annual precipitation averages 21.2 Inches. 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 | -26.4 °F | -22.6 °F | 203.2 in. |
| February | -26.3 °F | -22.2 °F | 76.2 in. |
| March | -24 °F | -20.5 °F | 177.8 in. |
| April | -20.7 °F | -18 °F | 584.2 in. |
| May | -18.2 °F | -15.1 °F | 1320.8 in. |
| June | -15.4 °F | -11.3 °F | 1524 in. |
| July | -12.8 °F | -8.6 °F | 1930.4 in. |
| August | -12.4 °F | -8.4 °F | 1752.6 in. |
| September | -14.6 °F | -11 °F | 1905 in. |
| October | -16.8 °F | -14.4 °F | 2311.4 in. |
| November | -19.8 °F | -17.6 °F | 1346.2 in. |
| December | -23.5 °F | -20.6 °F | 558.8 in. |
| Annual | 27.3 °F | 38.3 °F | 21.23 in. |
| 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°F to -35°F |
| Current Drought Conditions | Abnormally Dry |