Oakville, Ontario climate data is summarized below. Average annual temperatures range from 41.6 °F (low) to 56 °F (high). Annual precipitation averages 36.3 Inches. 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 | -21.6 °F | -18 °F | 609.6 in. |
| February | -22.3 °F | -18.3 °F | 889 in. |
| March | -19.1 °F | -14.8 °F | 1955.8 in. |
| April | -16 °F | -11.2 °F | 2438.4 in. |
| May | -12.7 °F | -7.4 °F | 2590.8 in. |
| June | -9.5 °F | -4.5 °F | 2184.4 in. |
| July | -7.9 °F | -2.8 °F | 2565.4 in. |
| August | -8.1 °F | -3.2 °F | 2590.8 in. |
| September | -10.5 °F | -5.5 °F | 1955.8 in. |
| October | -13.7 °F | -9.4 °F | 2209.8 in. |
| November | -16.9 °F | -13 °F | 1727.2 in. |
| December | -19.5 °F | -16.4 °F | 1676.4 in. |
| Annual | 41.6 °F | 56 °F | 36.28 in. |
| 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 : -5°F to 0°F |
| Current Drought Conditions | Normal |