The major climate region that is not typically found in Canada is the Humid subtropical climate. While Canada has a variety of climate regions, such as Arctic, subarctic, continental, and maritime climates, the humid subtropical climate is more commonly found in regions such as the southeastern United States and parts of Asia.
Additionally, the Mediterranean climate is also not found in Canada. The Arid climate can be found in some areas, particularly in the southern regions of Alberta and Saskatchewan, where there's a semi-arid climate.
So, if you're looking for the climate region that is least representative of Canada's climate, it would be the Humid subtropical climate.