Morrisburg, Ontario climate data is summarized below. Average annual temperatures range from 35.8 °F (low) to 54.6 °F (high). Annual precipitation averages 28.1 Inches. Morrisburg is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -24.9 °F | -19.7 °F | 25.4 in. |
| February | -24.9 °F | -19.5 °F | 101.6 in. |
| March | -21.3 °F | -15.6 °F | 711.2 in. |
| April | -17 °F | -10.7 °F | 1549.4 in. |
| May | -13.4 °F | -6.6 °F | 2057.4 in. |
| June | -10.7 °F | -4.3 °F | 2540 in. |
| July | -9.3 °F | -2.8 °F | 3378.2 in. |
| August | -9.8 °F | -3.3 °F | 2438.4 in. |
| September | -12.3 °F | -5.7 °F | 1828.8 in. |
| October | -15.2 °F | -9.8 °F | 1930.4 in. |
| November | -18.5 °F | -13.7 °F | 1016 in. |
| December | -22.2 °F | -18.2 °F | 533.4 in. |
| Annual | 35.8 °F | 54.6 °F | 28.07 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |