Fredericton, New Brunswick climate data is summarized below. Average annual temperatures range from 33.3 °F (low) to 52 °F (high). Annual precipitation averages 34.7 Inches. Fredericton 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 | -25.4 °F | -20 °F | 304.8 in. |
| February | -25 °F | -19.3 °F | 457.2 in. |
| March | -22.4 °F | -16.4 °F | 1651 in. |
| April | -18.4 °F | -12.3 °F | 1981.2 in. |
| May | -14.8 °F | -8.4 °F | 2336.8 in. |
| June | -12 °F | -5.8 °F | 2336.8 in. |
| July | -9.8 °F | -3.7 °F | 2032 in. |
| August | -10.2 °F | -4 °F | 2082.8 in. |
| September | -13 °F | -6.5 °F | 1879.6 in. |
| October | -16 °F | -10.5 °F | 2921 in. |
| November | -18.9 °F | -14.2 °F | 2819.4 in. |
| December | -22.7 °F | -18.1 °F | 1600.2 in. |
| Annual | 33.3 °F | 52 °F | 34.72 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 | Moderate Drought |