Powassan, Ontario climate data is summarized below. Average annual temperatures range from 32.2 °F (low) to 50.6 °F (high). Annual precipitation averages 25.6 Inches. Powassan is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -26.3 °F | -21.1 °F | 0 in. |
| February | -26.6 °F | -20.9 °F | 0 in. |
| March | -22.5 °F | -16.9 °F | 508 in. |
| April | -18.2 °F | -12.1 °F | 1574.8 in. |
| May | -14.5 °F | -7.5 °F | 1803.4 in. |
| June | -11.5 °F | -4.9 °F | 1955.8 in. |
| July | -10.2 °F | -3.8 °F | 2260.6 in. |
| August | -10.4 °F | -4.4 °F | 2438.4 in. |
| September | -13.1 °F | -7 °F | 2260.6 in. |
| October | -16 °F | -11.2 °F | 2590.8 in. |
| November | -19.5 °F | -15.2 °F | 1117.6 in. |
| December | -23.8 °F | -19.5 °F | 0 in. |
| Annual | 32.2 °F | 50.6 °F | 25.59 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |