Ballantrae, Ontario climate data is summarized below. Average annual temperatures range from 2.6 °C (low) to 11.9 °C (high). Annual precipitation averages 856 Millimeters. Ballantrae 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 | -10.46 °C | -2.58 °C | 14 mm |
| February | -11.61 °C | -3.03 °C | 6 mm |
| March | -6.07 °C | 3.59 °C | 52 mm |
| April | 1.29 °C | 11.3 °C | 81 mm |
| May | 7.71 °C | 18.8 °C | 106 mm |
| June | 12.7 °C | 23.38 °C | 108 mm |
| July | 15.23 °C | 25.95 °C | 122 mm |
| August | 14.62 °C | 25.01 °C | 124 mm |
| September | 10.2 °C | 20.48 °C | 79 mm |
| October | 5.02 °C | 13.3 °C | 73 mm |
| November | -0.88 °C | 6.78 °C | 52 mm |
| December | -6.23 °C | 0.16 °C | 39 mm |
| Annual | 2.6 °C | 11.9 °C | 856 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 |