Ontario

Because of the influence of the Great Lakes, Ontario experiences smaller variations in temperature and higher precipitation than would otherwise be expected for a region in the heart of a continent.

In summer, this imposing body of water has a cooling effect on neighbouring cities. However, in the south of the province, such as in Windsor or Toronto, heat waves lasting up to a week, with temperatures higher than 30 °C, are not uncommon.

In the fall, the release of heat stored in the lakes has a moderating effect. Comfortable, sunny days and cool, bracing nights make this season a favourite time of year.

Winter is characterized by alternating currents of cold arctic air and relatively warm air masses from the Gulf of Mexico. A city such as Sudbury, at north of the Great Lakes, is obviously more subject to arctic air currents and consequently has a more severe winter.

Take advantage of your trip to Ontario to visit Ottawa, the Nation’s Capital, as well as Niagara Falls. The 6 million litres of water per second that can pour over these falls makes it one of the country’s biggest attractions.

See our photos of Ontario .

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Average temperatures

City	Average maximum daytime temperatures
	January	April	July	October
Sudbury	-9 ºC	8 ºC	25 ºC	10 ºC
Ottawa	-6 ºC	11 ºC	26 ºC	13 ºC
Toronto	-3 ºC	12 ºC	27 ºC	14 ºC
Windsor	-1 ºC	13 ºC	28 ºC	16 ºC

Celsius (°C) to Fahrenheit (°F) converter

Probability of snow and rain

City	Number of days with precipitation
	January	April	July	October
Sudbury	Rain 7% Snow 60%	Rain 33% Snow 20%	Rain 33%	Rain 33% Snow 10%
Ottawa	Rain 10% Snow 50%	Rain 33% Snow 10%	Rain 33%	Rain 33%
Toronto	Rain 17% Snow 33%	Rain 33% Snow 10%	Rain 33%	Rain 33%
Windsor	Rain 17% Snow 33%	Rain 33% Snow 7%	Rain 33%	Rain 33%

Duration of winter

City	Snow on the ground from:
Sudbury	December to March
Ottawa	December to March
Toronto	December to February
Windsor	December to February