Stratford, Ontario climate data is summarized below. Average annual temperatures range from 2.6 °C (low) to 12.1 °C (high). Annual precipitation averages 416 Millimeters. Stratford is located in USDA Plant Hardiness Zone 6a. 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 | -9.89 °C | -2.71 °C | 0 mm |
| February | -11.36 °C | -3.08 °C | 0 mm |
| March | -5.25 °C | 3.96 °C | 21 mm |
| April | 1.03 °C | 11.79 °C | 28 mm |
| May | 7.55 °C | 19.09 °C | 47 mm |
| June | 12.54 °C | 23.7 °C | 69 mm |
| July | 14.43 °C | 25.73 °C | 91 mm |
| August | 14 °C | 24.83 °C | 71 mm |
| September | 9.96 °C | 20.91 °C | 47 mm |
| October | 4.91 °C | 13.97 °C | 23 mm |
| November | -0.69 °C | 6.79 °C | 13 mm |
| December | -5.51 °C | 0.36 °C | 6 mm |
| Annual | 2.6 °C | 12.1 °C | 416 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |