St. Stephen, New Brunswick climate data is summarized below. Average annual temperatures range from 34.1 °F (low) to 53.5 °F (high). Annual precipitation averages 37.6 Inches. St. Stephen 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -24.8 °F | -19.1 °F | 635 in. |
| February | -24.4 °F | -18.5 °F | 762 in. |
| March | -21.7 °F | -15.6 °F | 1778 in. |
| April | -17.9 °F | -11.7 °F | 2387.6 in. |
| May | -14.7 °F | -8.3 °F | 2438.4 in. |
| June | -12 °F | -5.7 °F | 2133.6 in. |
| July | -10 °F | -3.6 °F | 2108.2 in. |
| August | -10.4 °F | -3.9 °F | 1981.2 in. |
| September | -12.9 °F | -6.4 °F | 1879.6 in. |
| October | -15.8 °F | -10.1 °F | 2895.6 in. |
| November | -18.7 °F | -13.7 °F | 2895.6 in. |
| December | -22.2 °F | -17.3 °F | 2387.6 in. |
| Annual | 34.1 °F | 53.5 °F | 37.64 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| 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 |