we've had mid-high 90's with incredible humidity - the "feels like" index is at like 106, most days. But at least it usually rains in the afternoon to cool off the roofs. The other thing is for us, down here the heat doesn't go away. Not sure about Ontario, but my friend in New York pointed out that while it does get incredibly hot there at times, eventually within a week or less then finally some cooler days come. With us there's no break til mid October. It's "stay inside and mess with yer stereo" season.