Alexandria, Ontario climate data is summarized below. Average annual temperatures range from 1.5 °C (low) to 11.8 °C (high). Annual precipitation averages 615 Millimeters. Alexandria 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 | -14.05 °C | -4.67 °C | 0 mm |
| February | -13.75 °C | -4.1 °C | 0 mm |
| March | -7.42 °C | 2.54 °C | 20 mm |
| April | 0.91 °C | 11.73 °C | 56 mm |
| May | 7.46 °C | 19.59 °C | 68 mm |
| June | 12.83 °C | 24.16 °C | 94 mm |
| July | 15.32 °C | 26.81 °C | 111 mm |
| August | 14.38 °C | 25.87 °C | 89 mm |
| September | 9.48 °C | 21.45 °C | 67 mm |
| October | 4.06 °C | 13.81 °C | 69 mm |
| November | -2.01 °C | 6.58 °C | 33 mm |
| December | -9 °C | -1.7 °C | 8 mm |
| Annual | 1.5 °C | 11.8 °C | 615 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 |