Brampton, Ontario climate data is summarized below. Average annual temperatures range from 4 °C (low) to 13.2 °C (high). Annual precipitation averages 867 Millimeters. Brampton is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9 °C | -1.69 °C | 15 mm |
| February | -10.07 °C | -1.97 °C | 20 mm |
| March | -4.32 °C | 5.01 °C | 60 mm |
| April | 2.31 °C | 12.5 °C | 90 mm |
| May | 8.73 °C | 19.83 °C | 103 mm |
| June | 14 °C | 24.62 °C | 94 mm |
| July | 16.81 °C | 27.38 °C | 102 mm |
| August | 16.15 °C | 26.48 °C | 126 mm |
| September | 11.73 °C | 22.08 °C | 75 mm |
| October | 6.11 °C | 14.61 °C | 73 mm |
| November | 0.19 °C | 7.89 °C | 61 mm |
| December | -4.99 °C | 1.1 °C | 48 mm |
| Annual | 4 °C | 13.2 °C | 867 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |