Assuming summer is over, Toronto saves a lot on air conditioning

 The 'physics-happy' way of determining heat energy, is to look at the cooling degree days, rather than the odd peak temperature.  

It's good that we save electricity, because the windmills could be used for hanging laundry all this summer.  However, wait until the 'heating degree days'.  This chart has been quite steady, mainly because of the lakes.

We can always hope for some more heat for the rest of the expected summer.

ps.  Geez, that was cold on the dog walk.  Fine late October weather.  You could almost think of snow.