Brantford, Ontario climate data is summarized below. Average annual temperatures range from 3.7 °C (low) to 13.8 °C (high). Annual precipitation averages 659 Millimeters. Brantford is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.29 °C | -1.03 °C | 10 mm |
| February | -9.86 °C | -1.32 °C | 13 mm |
| March | -3.85 °C | 6 °C | 49 mm |
| April | 1.98 °C | 13.29 °C | 59 mm |
| May | 8.1 °C | 20.45 °C | 70 mm |
| June | 13.44 °C | 25.23 °C | 73 mm |
| July | 15.67 °C | 27.92 °C | 99 mm |
| August | 15.02 °C | 26.91 °C | 96 mm |
| September | 10.91 °C | 22.58 °C | 70 mm |
| October | 5.75 °C | 15.54 °C | 52 mm |
| November | -0.17 °C | 8.4 °C | 38 mm |
| December | -4.45 °C | 1.96 °C | 30 mm |
| Annual | 3.7 °C | 13.8 °C | 659 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |