Massey, Ontario climate data is summarized below. Average annual temperatures range from 32.9 °F (low) to 50.7 °F (high). Annual precipitation averages 24.1 Inches. Massey is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -26.3 °F | -20.9 °F | 0 in. |
| February | -26.8 °F | -20.5 °F | 0 in. |
| March | -23 °F | -16.9 °F | 558.8 in. |
| April | -18.5 °F | -12.7 °F | 1752.6 in. |
| May | -14.2 °F | -8 °F | 1701.8 in. |
| June | -11.1 °F | -5.2 °F | 1651 in. |
| July | -9.8 °F | -3.9 °F | 1600.2 in. |
| August | -10 °F | -4.3 °F | 1879.6 in. |
| September | -12.5 °F | -6.8 °F | 1879.6 in. |
| October | -15.6 °F | -10.8 °F | 2641.6 in. |
| November | -18.8 °F | -14.8 °F | 1473.2 in. |
| December | -23.5 °F | -19.1 °F | 381 in. |
| Annual | 32.9 °F | 50.7 °F | 24.05 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |