In the northeastern parts of Ontario, extending far as south as Kirkland Lake, the cold waters of Hudson Bay depress summer temperatures, making it cooler than other locations at similar latitudes. The same is true on the northern shore of Lake Superior, which cools hot humid air from the south, leading to cooler summer temperatures. Along the eastern shores of Lake Superior and Lake Huron winter temperatures are slightly moderated but come with frequent heavy lake-effect snow squalls that increase seasonal snowfall totals upwards of 3 m (10 ft) in some places. These regions have higher annual precipitation in some case over 100 cm (39 in). 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. Snowfall accumulation can be high in some areas. Precipitation is generally less than 70 cm (28 in) and peaks in the summer months in the form of rain or thunderstorms.
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