Stayner, Ontario climate data is summarized below. Average annual temperatures range from 2.3 °C (low) to 12 °C (high). Annual precipitation averages 404 Millimeters. Stayner 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.18 °C | -2.42 °C | 1 mm |
| February | -11.08 °C | -3.01 °C | 0 mm |
| March | -5.49 °C | 3.65 °C | 15 mm |
| April | 0.45 °C | 11.23 °C | 27 mm |
| May | 6.3 °C | 18.45 °C | 51 mm |
| June | 11.64 °C | 22.94 °C | 61 mm |
| July | 14.3 °C | 25.66 °C | 84 mm |
| August | 13.81 °C | 24.91 °C | 78 mm |
| September | 9.72 °C | 20.93 °C | 42 mm |
| October | 4.99 °C | 14.11 °C | 25 mm |
| November | -0.89 °C | 7.36 °C | 14 mm |
| December | -6.18 °C | 0.42 °C | 6 mm |
| Annual | 2.3 °C | 12 °C | 404 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 |