LaSalle, Ontario climate data is summarized below. Average annual temperatures range from 6 °C (low) to 14.6 °C (high). Annual precipitation averages 625 Millimeters. LaSalle is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.06 °C | -0.51 °C | 19 mm |
| February | -7.38 °C | -0.44 °C | 10 mm |
| March | -1.16 °C | 7.55 °C | 43 mm |
| April | 4.17 °C | 14.31 °C | 59 mm |
| May | 10.54 °C | 20.95 °C | 72 mm |
| June | 16.18 °C | 25.86 °C | 81 mm |
| July | 18.53 °C | 28.12 °C | 73 mm |
| August | 17.98 °C | 27.3 °C | 70 mm |
| September | 13.61 °C | 23 °C | 73 mm |
| October | 7.77 °C | 16.38 °C | 45 mm |
| November | 1.7 °C | 9.24 °C | 48 mm |
| December | -3.01 °C | 2.74 °C | 32 mm |
| Annual | 6 °C | 14.6 °C | 625 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |