Sutton, Ontario climate data is summarized below. Average annual temperatures range from 3.4 °C (low) to 11.3 °C (high). Annual precipitation averages 679 Millimeters. Sutton is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.97 °C | -2.59 °C | 10 mm |
| February | -11.29 °C | -3.18 °C | 0 mm |
| March | -5.24 °C | 2.96 °C | 35 mm |
| April | 1.22 °C | 9.85 °C | 52 mm |
| May | 7.25 °C | 16.85 °C | 80 mm |
| June | 12.78 °C | 21.59 °C | 100 mm |
| July | 16.21 °C | 24.68 °C | 125 mm |
| August | 16.07 °C | 24.16 °C | 106 mm |
| September | 12.03 °C | 20.22 °C | 67 mm |
| October | 6.79 °C | 13.58 °C | 48 mm |
| November | 0.52 °C | 7.08 °C | 34 mm |
| December | -5.27 °C | 0.41 °C | 22 mm |
| Annual | 3.4 °C | 11.3 °C | 679 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |