Miramichi, New Brunswick climate data is summarized below. Average annual temperatures range from 32.8 °F (low) to 50.9 °F (high). Annual precipitation averages 18 Inches. 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 | -25.8 °F | -20.2 °F | 0 in. |
| February | -25.4 °F | -19.6 °F | 0 in. |
| March | -23.1 °F | -17.2 °F | 254 in. |
| April | -18.7 °F | -13.3 °F | 508 in. |
| May | -15.1 °F | -8.9 °F | 889 in. |
| June | -12.1 °F | -6.1 °F | 1549.4 in. |
| July | -9.7 °F | -3.7 °F | 2286 in. |
| August | -10 °F | -4.2 °F | 2590.8 in. |
| September | -12.8 °F | -6.7 °F | 1320.8 in. |
| October | -15.9 °F | -10.6 °F | 1092.2 in. |
| November | -18.8 °F | -14.4 °F | 939.8 in. |
| December | -23.1 °F | -18.5 °F | 152.4 in. |
| Annual | 32.8 °F | 50.9 °F | 17.96 in. |
| 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 : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |