Campbellton, New Brunswick climate data is summarized below. Average annual temperatures range from -0.6 °C (low) to 9.2 °C (high). Annual precipitation averages 602 Millimeters. 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 | -15.75 °C | -6.43 °C | 0 mm |
| February | -14.37 °C | -4.95 °C | 0 mm |
| March | -11.71 °C | -0.95 °C | 0 mm |
| April | -3.81 °C | 5.04 °C | 36 mm |
| May | 4.21 °C | 15.21 °C | 65 mm |
| June | 9.88 °C | 20.88 °C | 94 mm |
| July | 13.93 °C | 24.81 °C | 113 mm |
| August | 13.39 °C | 24.15 °C | 95 mm |
| September | 8.3 °C | 19.21 °C | 77 mm |
| October | 2.9 °C | 11.74 °C | 71 mm |
| November | -2.93 °C | 4.36 °C | 46 mm |
| December | -11.27 °C | -3.19 °C | 5 mm |
| Annual | -0.6 °C | 9.2 °C | 602 mm |
| 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 : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |