St. John's, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from 3.4 °C (low) to 7.5 °C (high). Annual precipitation averages 986 Millimeters. 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 | -4.48 °C | 0.23 °C | 68 mm |
| February | -5.16 °C | -0.75 °C | 67 mm |
| March | -3.85 °C | -0.06 °C | 60 mm |
| April | -0.73 °C | 2.93 °C | 70 mm |
| May | 2.88 °C | 6.78 °C | 79 mm |
| June | 6.85 °C | 10.98 °C | 67 mm |
| July | 12.02 °C | 16.54 °C | 80 mm |
| August | 13.79 °C | 17.94 °C | 76 mm |
| September | 11.07 °C | 15.37 °C | 97 mm |
| October | 7.22 °C | 10.87 °C | 110 mm |
| November | 2.95 °C | 6.85 °C | 106 mm |
| December | -1.36 °C | 2.85 °C | 106 mm |
| Annual | 3.4 °C | 7.5 °C | 986 mm |
| 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 : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |