Sheffield, Ontario climate data is summarized below. Average annual temperatures range from 3.4 °C (low) to 13.4 °C (high). Annual precipitation averages 944 Millimeters. Sheffield is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.7 °C | -1.36 °C | 21 mm |
| February | -10.12 °C | -1.69 °C | 25 mm |
| March | -4.38 °C | 5.39 °C | 66 mm |
| April | 1.77 °C | 12.86 °C | 97 mm |
| May | 7.94 °C | 19.98 °C | 107 mm |
| June | 13.17 °C | 24.71 °C | 107 mm |
| July | 15.43 °C | 27.41 °C | 124 mm |
| August | 14.82 °C | 26.5 °C | 108 mm |
| September | 10.71 °C | 22.18 °C | 92 mm |
| October | 5.45 °C | 15.11 °C | 82 mm |
| November | -0.21 °C | 8.12 °C | 61 mm |
| December | -4.83 °C | 1.59 °C | 54 mm |
| Annual | 3.4 °C | 13.4 °C | 944 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |