St. John's, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from 38.2 °F (low) to 45.6 °F (high). Annual precipitation averages 38.8 Inches. St. John's is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -20.3 °F | -17.7 °F | 1727.2 in. |
| February | -20.6 °F | -18.2 °F | 1701.8 in. |
| March | -19.9 °F | -17.8 °F | 1524 in. |
| April | -18.2 °F | -16.2 °F | 1778 in. |
| May | -16.2 °F | -14 °F | 2006.6 in. |
| June | -14 °F | -11.7 °F | 1701.8 in. |
| July | -11.1 °F | -8.6 °F | 2032 in. |
| August | -10.1 °F | -7.8 °F | 1930.4 in. |
| September | -11.6 °F | -9.2 °F | 2463.8 in. |
| October | -13.8 °F | -11.7 °F | 2794 in. |
| November | -16.1 °F | -14 °F | 2692.4 in. |
| December | -18.5 °F | -16.2 °F | 2692.4 in. |
| Annual | 38.2 °F | 45.6 °F | 38.82 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |