St. Brendan's, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from 36 °F (low) to 44.7 °F (high). Annual precipitation averages 35.2 Inches. St. Brendan's is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -21.5 °F | -18.6 °F | 990.6 in. |
| February | -21.9 °F | -19 °F | 965.2 in. |
| March | -20.9 °F | -18.3 °F | 914.4 in. |
| April | -18.7 °F | -16.4 °F | 1346.2 in. |
| May | -16.5 °F | -13.8 °F | 1879.6 in. |
| June | -14 °F | -11.1 °F | 1905 in. |
| July | -11.1 °F | -8 °F | 2159 in. |
| August | -10.5 °F | -7.6 °F | 2336.8 in. |
| September | -12.3 °F | -9.3 °F | 2667 in. |
| October | -14.5 °F | -12.2 °F | 2844.8 in. |
| November | -17 °F | -14.7 °F | 2717.8 in. |
| December | -19.6 °F | -17.1 °F | 1981.2 in. |
| Annual | 36 °F | 44.7 °F | 35.2 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |