Bradford, Ontario climate data is summarized below. Average annual temperatures range from 2.7 °C (low) to 12.6 °C (high). Annual precipitation averages 768 Millimeters. Bradford 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 | -9.95 °C | -2.24 °C | 10 mm |
| February | -11.12 °C | -2.65 °C | 2 mm |
| March | -5.33 °C | 4.09 °C | 41 mm |
| April | 1.16 °C | 12.04 °C | 66 mm |
| May | 7.21 °C | 19.66 °C | 99 mm |
| June | 12.32 °C | 24.16 °C | 107 mm |
| July | 14.96 °C | 26.7 °C | 133 mm |
| August | 14.36 °C | 25.71 °C | 114 mm |
| September | 10.1 °C | 21.3 °C | 70 mm |
| October | 5.09 °C | 14.08 °C | 55 mm |
| November | -0.73 °C | 7.35 °C | 43 mm |
| December | -5.92 °C | 0.54 °C | 28 mm |
| Annual | 2.7 °C | 12.6 °C | 768 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 |