I'm guessing at least 30degC.

Even in Ontario, it gets very, very hot, and it probably can get to 30degC on some summer days, in the shade.

I'm guessing tobacco likes the hot, dry sunshine, so I'm just saying, if you're going to grow it, do it outside in the blazing hot sunshine.

You could probably grow it if it's hot enough outdoors in your area. Doing it inside you'll need heaters, and your house will be hotter than shit too.