Dorchester, New Brunswick climate data is summarized below. Average annual temperatures range from 2 °C (low) to 10.6 °C (high). Annual precipitation averages 898 Millimeters. Dorchester is located in USDA Plant Hardiness Zone 5b. 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 | -10.94 °C | -2.65 °C | 18 mm |
| February | -10.61 °C | -2.08 °C | 4 mm |
| March | -7.1 °C | 1.79 °C | 26 mm |
| April | -0.13 °C | 8.38 °C | 65 mm |
| May | 5.21 °C | 14.79 °C | 80 mm |
| June | 10.21 °C | 19.18 °C | 112 mm |
| July | 14.4 °C | 23.34 °C | 103 mm |
| August | 14.31 °C | 23.15 °C | 106 mm |
| September | 10.24 °C | 19.25 °C | 102 mm |
| October | 5.2 °C | 13.43 °C | 98 mm |
| November | -0.09 °C | 7.29 °C | 96 mm |
| December | -6.2 °C | 0.98 °C | 88 mm |
| Annual | 2 °C | 10.6 °C | 898 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |