Brighton, Ontario climate data is summarized below. Average annual temperatures range from 4.2 °C (low) to 11.4 °C (high). Annual precipitation averages 697 Millimeters. Brighton is located in USDA Plant Hardiness Zone 6a. 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 | -8.7 °C | -1.25 °C | 14 mm |
| February | -9.82 °C | -1.84 °C | 8 mm |
| March | -3.88 °C | 3.63 °C | 42 mm |
| April | 2.23 °C | 9.44 °C | 73 mm |
| May | 7.86 °C | 15.3 °C | 78 mm |
| June | 13.43 °C | 20.39 °C | 91 mm |
| July | 16.52 °C | 23.66 °C | 105 mm |
| August | 16.39 °C | 23.66 °C | 87 mm |
| September | 12.23 °C | 20.16 °C | 53 mm |
| October | 7.08 °C | 14 °C | 62 mm |
| November | 1.19 °C | 7.93 °C | 46 mm |
| December | -4.71 °C | 1.59 °C | 38 mm |
| Annual | 4.2 °C | 11.4 °C | 697 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |