Grand Falls, New Brunswick climate data is summarized below. Average annual temperatures range from -0.6 °C (low) to 9.6 °C (high). Annual precipitation averages 883 Millimeters. Grand Falls is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -16.16 °C | -6.19 °C | 0 mm |
| February | -14.84 °C | -4.87 °C | 0 mm |
| March | -10.55 °C | 0.33 °C | 25 mm |
| April | -2.04 °C | 8.39 °C | 69 mm |
| May | 4.95 °C | 16.5 °C | 97 mm |
| June | 9.96 °C | 20.99 °C | 124 mm |
| July | 13.57 °C | 24.54 °C | 149 mm |
| August | 12.64 °C | 23.8 °C | 105 mm |
| September | 7.63 °C | 18.98 °C | 82 mm |
| October | 2.32 °C | 11.63 °C | 104 mm |
| November | -3.17 °C | 4.44 °C | 92 mm |
| December | -11.01 °C | -2.97 °C | 36 mm |
| Annual | -0.6 °C | 9.6 °C | 883 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |