Grand Falls, New Brunswick climate data is summarized below. Average annual temperatures range from 31 °F (low) to 49.3 °F (high). Annual precipitation averages 34.8 Inches. 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 | -26.8 °F | -21.2 °F | 0 in. |
| February | -26 °F | -20.5 °F | 0 in. |
| March | -23.6 °F | -17.6 °F | 635 in. |
| April | -18.9 °F | -13.1 °F | 1752.6 in. |
| May | -15 °F | -8.6 °F | 2463.8 in. |
| June | -12.2 °F | -6.1 °F | 3149.6 in. |
| July | -10.2 °F | -4.1 °F | 3784.6 in. |
| August | -10.8 °F | -4.6 °F | 2667 in. |
| September | -13.5 °F | -7.2 °F | 2082.8 in. |
| October | -16.5 °F | -11.3 °F | 2641.6 in. |
| November | -19.5 °F | -15.3 °F | 2336.8 in. |
| December | -23.9 °F | -19.4 °F | 914.4 in. |
| Annual | 31 °F | 49.3 °F | 34.76 in. |
| 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 : -30°F to -25°F |
| Current Drought Conditions | Normal |