Grand Falls, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from -0.1 °C (low) to 7.8 °C (high). Annual precipitation averages 791 Millimeters. Grand Falls is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.64 °C | -3.56 °C | 20 mm |
| February | -11.38 °C | -3.88 °C | 26 mm |
| March | -9.38 °C | -1.96 °C | 21 mm |
| April | -3.49 °C | 3.56 °C | 48 mm |
| May | 1.47 °C | 10.55 °C | 72 mm |
| June | 6.4 °C | 16.09 °C | 77 mm |
| July | 11.43 °C | 21.66 °C | 86 mm |
| August | 11.31 °C | 21.11 °C | 103 mm |
| September | 7.48 °C | 16.41 °C | 102 mm |
| October | 3.27 °C | 9.82 °C | 103 mm |
| November | -1.14 °C | 4.44 °C | 86 mm |
| December | -6.13 °C | -0.58 °C | 47 mm |
| Annual | -0.1 °C | 7.8 °C | 791 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |