Marystown, Newfoundland and Labrador climate data is summarized below. Average annual temperatures range from 38.2 °F (low) to 46.9 °F (high). Annual precipitation averages 51.3 Inches. Marystown 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 | -20.5 °F | -17.7 °F | 2235.2 in. |
| February | -21.1 °F | -18.4 °F | 2032 in. |
| March | -20.2 °F | -17.7 °F | 2006.6 in. |
| April | -18.1 °F | -15.5 °F | 2463.8 in. |
| May | -15.8 °F | -12.9 °F | 2413 in. |
| June | -13.5 °F | -10.7 °F | 2590.8 in. |
| July | -10.9 °F | -8.2 °F | 2844.8 in. |
| August | -9.9 °F | -7.1 °F | 2819.4 in. |
| September | -11.5 °F | -8.7 °F | 3251.2 in. |
| October | -13.8 °F | -11.4 °F | 3708.4 in. |
| November | -16.3 °F | -13.8 °F | 3683 in. |
| December | -18.7 °F | -16.1 °F | 3022.6 in. |
| Annual | 38.2 °F | 46.9 °F | 51.27 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |