Sussex, New Brunswick climate data is summarized below. Average annual temperatures range from 34.6 °F (low) to 52.7 °F (high). Annual precipitation averages 27.5 Inches. 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 | -24.7 °F | -19.5 °F | 279.4 in. |
| February | -24.5 °F | -19 °F | 76.2 in. |
| March | -22.2 °F | -16.6 °F | 635 in. |
| April | -18 °F | -12.3 °F | 1219.2 in. |
| May | -14.7 °F | -8.3 °F | 1625.6 in. |
| June | -11.8 °F | -5.8 °F | 2590.8 in. |
| July | -9.5 °F | -3.5 °F | 2209.8 in. |
| August | -9.8 °F | -3.8 °F | 2032 in. |
| September | -12.5 °F | -6.4 °F | 2006.6 in. |
| October | -15.5 °F | -10.1 °F | 1981.2 in. |
| November | -18.4 °F | -13.8 °F | 2082.8 in. |
| December | -22.2 °F | -17.5 °F | 990.6 in. |
| Annual | 34.6 °F | 52.7 °F | 27.49 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 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |