Miramichi, New Brunswick climate data is summarized below. Average annual temperatures range from 0.4 °C (low) to 10.5 °C (high). Annual precipitation averages 456 Millimeters. Miramichi is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.43 °C | -4.34 °C | 0 mm |
| February | -13.65 °C | -3.25 °C | 0 mm |
| March | -9.53 °C | 1.09 °C | 10 mm |
| April | -1.63 °C | 8.1 °C | 20 mm |
| May | 4.81 °C | 16 °C | 35 mm |
| June | 10.3 °C | 20.96 °C | 61 mm |
| July | 14.52 °C | 25.31 °C | 90 mm |
| August | 14.02 °C | 24.46 °C | 102 mm |
| September | 8.95 °C | 20.01 °C | 52 mm |
| October | 3.42 °C | 12.86 °C | 43 mm |
| November | -1.92 °C | 6.05 °C | 37 mm |
| December | -9.61 °C | -1.3 °C | 6 mm |
| Annual | 0.4 °C | 10.5 °C | 456 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Abnormally Dry |