Morrisburg, Ontario climate data is summarized below. Average annual temperatures range from 2.1 °C (low) to 12.5 °C (high). Annual precipitation averages 713 Millimeters. 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 | -12.81 °C | -3.47 °C | 1 mm |
| February | -12.83 °C | -3.05 °C | 4 mm |
| March | -6.35 °C | 3.89 °C | 28 mm |
| April | 1.45 °C | 12.67 °C | 61 mm |
| May | 7.83 °C | 20.19 °C | 81 mm |
| June | 12.78 °C | 24.33 °C | 100 mm |
| July | 15.32 °C | 26.99 °C | 133 mm |
| August | 14.44 °C | 26.08 °C | 96 mm |
| September | 9.84 °C | 21.74 °C | 72 mm |
| October | 4.69 °C | 14.41 °C | 76 mm |
| November | -1.24 °C | 7.32 °C | 40 mm |
| December | -7.91 °C | -0.69 °C | 21 mm |
| Annual | 2.1 °C | 12.5 °C | 713 mm |
| 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 : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |