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Ontario has three main climatic regions. Parts of Southwestern Ontario have a moderate humid continental climate (Köppen climate classification Dfa), similar to that of the inland Mid-Atlantic States and the Great Lakes portion of the Midwestern United States. The region has warm, humid summers and cold winters. Annual precipitation ranges from 75–100 cm (30–39 in) and is well distributed throughout the year with a usual summer peak. Most of this region lies in the lee of the Great Lakes making for abundant snow in some areas. Point Pelee and Middle Island, the southernmost parts of the country, are at the dividing line of a humid continental climate and a humid subtropical climate (Dfa/Cfa).

 

Central and Eastern Ontario have a more severe humid continental climate (Köppen Dfb). This region has warm and sometimes hot summers with colder longer winters, with ample snowfall and roughly equal annual precipitation as the rest of Southern Ontario. Along the eastern shores of Lake Superior and Lake Huron, frequent heavy lake-effect snow squalls increase seasonal snowfall totals upwards of 3 m (120 in) in some places.

 

The northernmost parts of Ontario — primarily north of 50°N have a subarctic climate (Köppen Dfc) with long, severely cold winters and short, cool to warm summers with dramatic temperature changes possible in all seasons. With no major mountain ranges blocking sinking Arctic air masses, temperatures of −40 °C (−40 °F) are not uncommon, snowfall remains on the ground for sometimes over half the year. Precipitation is generally less than 70 cm (28 in).

 

Severe and non-severe thunderstorms peak in summer. London, situated in Southern (Southwestern) Ontario, has the most lightning strikes per year in Canada, averaging 34 days of thunderstorm activity per year. In a typical year, Ontario averages 15 confirmed tornado touchdowns, though they are rarely destructive (the majority between F0 to F2 on the Fujita scale). Tropical depression remnants occasionally bring heavy rains and winds in the south, but are rarely deadly. A notable exception was Hurricane Hazel which struck Toronto, in October 1954. Winter storms can disrupt power supply and transportation, severe ice storms can also occur, especially in the east.