Niagara-on-the-Lake, Ontario climate data is summarized below. Average annual temperatures range from 6.1 °C (low) to 13.4 °C (high). Annual precipitation averages 812 Millimeters. Niagara-on-the-Lake 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 | -5.46 °C | 0.4 °C | 30 mm |
| February | -6.57 °C | -0.47 °C | 23 mm |
| March | -1.71 °C | 5.43 °C | 58 mm |
| April | 3.4 °C | 11.77 °C | 81 mm |
| May | 9 °C | 18.44 °C | 81 mm |
| June | 14.96 °C | 23.2 °C | 91 mm |
| July | 18.18 °C | 26.23 °C | 78 mm |
| August | 17.95 °C | 25.69 °C | 69 mm |
| September | 14 °C | 21.76 °C | 79 mm |
| October | 8.73 °C | 15.41 °C | 91 mm |
| November | 2.73 °C | 9.05 °C | 69 mm |
| December | -1.94 °C | 3.34 °C | 62 mm |
| Annual | 6.1 °C | 13.4 °C | 812 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 |