Correct. Hasn't been near 30C in Toronto this week (source: me, Toronto resident). This person could solve a lot of his problems with Toronto weather by moving close to the lake. It's generally a few degrees cooler in the summer, and warmer in the winter. Having four distinct seasons is nice, although fall (the best season, IMO) is way too short and winter is a bit too long.
I think being near the lake is definitely nicer in the summer, and probably winter too, as it moderates the temperature. On the other hand in the spring and fall, since the water temperature can be so much colder than the air, it can be quite cold and breezy by the lake, and nice and warm away from the lake.
