Oakville, Ontario climate data is summarized below. Average annual temperatures range from 5.3 °C (low) to 13.3 °C (high). Annual precipitation averages 921 Millimeters. Oakville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.91 °C | -0.45 °C | 24 mm |
| February | -8.2 °C | -0.92 °C | 35 mm |
| March | -2.46 °C | 5.41 °C | 77 mm |
| April | 3.22 °C | 11.88 °C | 96 mm |
| May | 9.21 °C | 18.69 °C | 102 mm |
| June | 14.82 °C | 23.96 °C | 86 mm |
| July | 17.71 °C | 26.98 °C | 101 mm |
| August | 17.37 °C | 26.3 °C | 102 mm |
| September | 13.15 °C | 22.09 °C | 77 mm |
| October | 7.43 °C | 15.1 °C | 87 mm |
| November | 1.6 °C | 8.55 °C | 68 mm |
| December | -3.01 °C | 2.44 °C | 66 mm |
| Annual | 5.3 °C | 13.3 °C | 921 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |