Speaking as a fellow Canadian . . . it is unbearably hot from May through October, but reasonably pleasant the rest of the year. There are about two or three weeks out of the year you might wear a jacket outside. However, you are unlikely ever to be outside for any length of time, except to dine. The offices and shopping malls are kept very cold and this is where you are most likely to want a jacket. In fact, it is cooler in these places than in most Canadian homes in winter.

But then everybody's concept of comfort is different, so you might find weather.com's website useful. It will give you the forecast, average temperature by month and average rainfall.