The surrounding Great Lakes influence Stratford's weather and fortunate enough to by-pass most of the harsh weather that affects the rest of the country. The winter season, December to March, averages -5°C (35.6°F) but temperatures can reach well below that. Snowfall can begin in late October and be capable of continuing well into March, occasionally April. Stratford's summer temperatures average 18.5°C (65°F).

The city is within close proximity to three of the Great Lakes, resulting in a humid climate. Summer stretches from May to September with July through September rainfall is at its peak.Fall days in Stratford are usually sun filled and the evenings are pleasant. These temperate conditions allow for crimson-coloured poplars and weeping willows.

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