I just think the idea that just because it is warmer today that it ever has been in history on this particular day is stupid. History is really such a short time.
I am 59 years of age, and without fail every July/August in the northern hemisphere it has been hot. Sometimes very hot. I remember two years in a row, the plant that I was working at had electricity taken for rolling blackouts during out fiscal year end process which happens on August 1st. This is just not a unusually phenomenon.
You are absolutely right, of course. Canada has been both much warmer and much colder.
When it was colder, Canada was often covered with ice for tens of thousands of years at a time.
When it was much warmer, Canada was sub-tropical, perhaps even tropical.