Lansdowne, Ontario climate data is summarized below. Average annual temperatures range from 3.3 °C (low) to 12.5 °C (high). Annual precipitation averages 845 Millimeters. Lansdowne 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.09 °C | -2.34 °C | 9 mm |
| February | -12.03 °C | -2.54 °C | 11 mm |
| March | -5.46 °C | 4.38 °C | 49 mm |
| April | 2.23 °C | 12.31 °C | 93 mm |
| May | 8.55 °C | 19.49 °C | 90 mm |
| June | 13.66 °C | 23.66 °C | 96 mm |
| July | 16.57 °C | 26.02 °C | 85 mm |
| August | 16.02 °C | 25.48 °C | 90 mm |
| September | 11.46 °C | 21.24 °C | 82 mm |
| October | 5.99 °C | 14.35 °C | 114 mm |
| November | -0.02 °C | 7.79 °C | 71 mm |
| December | -6.54 °C | 0.46 °C | 55 mm |
| Annual | 3.3 °C | 12.5 °C | 845 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |