Stratford, Ontario climate data is summarized below. Average annual temperatures range from 36.8 °F (low) to 53.8 °F (high). Annual precipitation averages 16.4 Inches. 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 | -23.3 °F | -19.3 °F | 0 in. |
| February | -24.1 °F | -19.5 °F | 0 in. |
| March | -20.7 °F | -15.6 °F | 533.4 in. |
| April | -17.2 °F | -11.2 °F | 711.2 in. |
| May | -13.6 °F | -7.2 °F | 1193.8 in. |
| June | -10.8 °F | -4.6 °F | 1752.6 in. |
| July | -9.8 °F | -3.5 °F | 2311.4 in. |
| August | -10 °F | -4 °F | 1803.4 in. |
| September | -12.2 °F | -6.2 °F | 1193.8 in. |
| October | -15.1 °F | -10 °F | 584.2 in. |
| November | -18.2 °F | -14 °F | 330.2 in. |
| December | -20.8 °F | -17.6 °F | 152.4 in. |
| Annual | 36.8 °F | 53.8 °F | 16.39 in. |
| 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 : -10°F to -5°F |
| Current Drought Conditions | Normal |