If your definition of "colder climate" is around 0°C, ugh-huh. It's −15°C where I live, and it's not even winter. In December-January I expect the usual −30-40°C, with down to −50°C for short periods of time. Open your windows for more than two minutes once every few hours and die.
Cannes weather is more like Vancouver. Toronto might not be as Cold as Winnipeg, Edmonton, or Montreal but it's in Canada. Other than if they lived in Vancouver, to say someone who lives in Canada doesn't know what it's like to live in a cold climate is strange.