Sussex, New Brunswick climate data is summarized below. Average annual temperatures range from 1.4 °C (low) to 11.5 °C (high). Annual precipitation averages 698 Millimeters. Sussex 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 | -12.54 °C | -3.17 °C | 11 mm |
| February | -12.18 °C | -2.17 °C | 3 mm |
| March | -7.96 °C | 2.06 °C | 25 mm |
| April | -0.36 °C | 9.93 °C | 48 mm |
| May | 5.63 °C | 16.98 °C | 64 mm |
| June | 10.74 °C | 21.61 °C | 102 mm |
| July | 14.82 °C | 25.7 °C | 87 mm |
| August | 14.33 °C | 25.15 °C | 80 mm |
| September | 9.53 °C | 20.48 °C | 79 mm |
| October | 4.14 °C | 13.87 °C | 78 mm |
| November | -1.1 °C | 7.19 °C | 82 mm |
| December | -7.99 °C | 0.46 °C | 39 mm |
| Annual | 1.4 °C | 11.5 °C | 698 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 |