You can't really talk about a universal canadian climate. I live right by Toronto and half of the year it's cold, because of fall and winter, and half of the year it's warm because of spring and summer, but in northern Ontario it's colder, and if you go even further north it's cold all year because of like Nunavut and shit.
I don't know about out east, or west, but I'm sure it's different depending on where you are in the country.
It's not winter for 9 months and summer for 3 everywhere.

And I'm Talking about the Dude, here.