This is Canada's Immigration website with all info re: immigration.

http://www.goingtocanada.gc.ca/CIC/display-afficher.do?id=0000000000102&...

Also from Gov't of Canada website, look on the left hand side fo the website for further info.

http://www.cic.gc.ca/english/index.asp

Not sure why you would want to travel to Canada when it's -40 weather, however I hope this helps.