Lansdowne, Ontario climate data is summarized below. Average annual temperatures range from 37.9 °F (low) to 54.5 °F (high). Annual precipitation averages 33.3 Inches. 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 | -23.9 °F | -19.1 °F | 228.6 in. |
| February | -24.5 °F | -19.2 °F | 279.4 in. |
| March | -20.8 °F | -15.3 °F | 1244.6 in. |
| April | -16.5 °F | -10.9 °F | 2362.2 in. |
| May | -13 °F | -7 °F | 2286 in. |
| June | -10.2 °F | -4.6 °F | 2438.4 in. |
| July | -8.6 °F | -3.3 °F | 2159 in. |
| August | -8.9 °F | -3.6 °F | 2286 in. |
| September | -11.4 °F | -6 °F | 2082.8 in. |
| October | -14.5 °F | -9.8 °F | 2895.6 in. |
| November | -17.8 °F | -13.5 °F | 1803.4 in. |
| December | -21.4 °F | -17.5 °F | 1397 in. |
| Annual | 37.9 °F | 54.5 °F | 33.27 in. |
| 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 : -10°F to -5°F |
| Current Drought Conditions | Normal |