St. Lawrence, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from 4 °C (low) to 8.4 °C (high). Annual precipitation averages 1280 Millimeters. St. Lawrence is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.19 °C | 0.6 °C | 84 mm |
| February | -5.21 °C | -0.7 °C | 78 mm |
| March | -3.59 °C | 0.59 °C | 80 mm |
| April | -0.2 °C | 4.17 °C | 101 mm |
| May | 3.75 °C | 8.53 °C | 94 mm |
| June | 7.87 °C | 12.48 °C | 104 mm |
| July | 12.72 °C | 17.05 °C | 111 mm |
| August | 14.62 °C | 19.12 °C | 103 mm |
| September | 11.8 °C | 16.4 °C | 124 mm |
| October | 7.71 °C | 11.7 °C | 141 mm |
| November | 3.27 °C | 7.47 °C | 142 mm |
| December | -0.97 °C | 3.48 °C | 118 mm |
| Annual | 4 °C | 8.4 °C | 1280 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |