Campbellton, New Brunswick climate data is summarized below. Average annual temperatures range from 30.9 °F (low) to 48.5 °F (high). Annual precipitation averages 23.7 Inches. Campbellton 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.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -26.5 °F | -21.4 °F | 0 in. |
| February | -25.8 °F | -20.5 °F | 0 in. |
| March | -24.3 °F | -18.3 °F | 0 in. |
| April | -19.9 °F | -15 °F | 914.4 in. |
| May | -15.4 °F | -9.3 °F | 1651 in. |
| June | -12.3 °F | -6.2 °F | 2387.6 in. |
| July | -10 °F | -4 °F | 2870.2 in. |
| August | -10.3 °F | -4.4 °F | 2413 in. |
| September | -13.2 °F | -7.1 °F | 1955.8 in. |
| October | -16.2 °F | -11.3 °F | 1803.4 in. |
| November | -19.4 °F | -15.4 °F | 1168.4 in. |
| December | -24 °F | -19.6 °F | 127 in. |
| Annual | 30.9 °F | 48.5 °F | 23.71 in. |
| Average First Frost Date | Sep.1 - Sep. 10 |
| 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 |