Welland, Ontario climate data is summarized below. Average annual temperatures range from 4.9 °C (low) to 13.7 °C (high). Annual precipitation averages 845 Millimeters. Welland is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.21 °C | -0.5 °C | 22 mm |
| February | -8.68 °C | -1.26 °C | 23 mm |
| March | -3.18 °C | 5.76 °C | 59 mm |
| April | 2.59 °C | 12.92 °C | 81 mm |
| May | 8.81 °C | 20.05 °C | 89 mm |
| June | 14.38 °C | 24.66 °C | 87 mm |
| July | 17.32 °C | 26.96 °C | 83 mm |
| August | 16.81 °C | 26.46 °C | 74 mm |
| September | 12.51 °C | 22.24 °C | 96 mm |
| October | 7.14 °C | 15.43 °C | 102 mm |
| November | 1.35 °C | 8.97 °C | 71 mm |
| December | -3.15 °C | 2.79 °C | 58 mm |
| Annual | 4.9 °C | 13.7 °C | 845 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |