Hawkesbury, Ontario climate data is summarized below. Average annual temperatures range from 1.3 °C (low) to 11.8 °C (high). Annual precipitation averages 495 Millimeters. Hawkesbury is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.71 °C | -5.08 °C | 0 mm |
| February | -14.32 °C | -4.3 °C | 0 mm |
| March | -7.88 °C | 2.23 °C | 14 mm |
| April | 0.87 °C | 11.8 °C | 40 mm |
| May | 7.59 °C | 19.8 °C | 48 mm |
| June | 12.88 °C | 24.34 °C | 81 mm |
| July | 15.25 °C | 26.91 °C | 105 mm |
| August | 14.41 °C | 25.91 °C | 85 mm |
| September | 9.64 °C | 21.43 °C | 51 mm |
| October | 4.16 °C | 13.84 °C | 48 mm |
| November | -2.08 °C | 6.4 °C | 20 mm |
| December | -9.77 °C | -1.99 °C | 3 mm |
| Annual | 1.3 °C | 11.8 °C | 495 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |