Branchton, Ontario climate data is summarized below. Average annual temperatures range from 3.3 °C (low) to 13.2 °C (high). Annual precipitation averages 927 Millimeters. Branchton 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 | -8.87 °C | -1.57 °C | 19 mm |
| February | -10.29 °C | -1.92 °C | 22 mm |
| March | -4.53 °C | 5.25 °C | 62 mm |
| April | 1.66 °C | 12.66 °C | 92 mm |
| May | 7.9 °C | 19.8 °C | 105 mm |
| June | 13.09 °C | 24.45 °C | 111 mm |
| July | 15.27 °C | 27.09 °C | 131 mm |
| August | 14.63 °C | 26.19 °C | 107 mm |
| September | 10.54 °C | 21.89 °C | 92 mm |
| October | 5.32 °C | 14.89 °C | 80 mm |
| November | -0.3 °C | 7.91 °C | 57 mm |
| December | -4.98 °C | 1.42 °C | 49 mm |
| Annual | 3.3 °C | 13.2 °C | 927 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 |