What is the climate and reason for the climate in Canada?

Canada's climate is not as cold all year around as some may believe. In winter, temperatures fall below freezing point throughout most of Canada. But the south-western coast has a relatively mild climate. Along the Arctic Circle, mean temperatures are below freezing for seven months a year.
During the summer months the southern provinces often experience high levels of humidity and temperatures that can surpass 30 degrees Celsius regularly.
Western and south-eastern Canada experience high rainfall, but the Prairies are dry with 250 mm to 500 mm of rain every year.
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