This is the Alberta followup the BC post. You can read the explnations.
In the terms of Tmax the coldest period in Alberta (using 5 year means) was 1972-1976.
The warmest period was 1940 – 1944. In fact it was 2C warmer in 1940-1944 than 2011 – 2015. (The 1930s were just slightly cooler than the early 40s)
You may ask why the green line of grid counts goes up and down so much. It appears there are many more stations reporting in May/Jun/Jul/Aug/Sep than in the winter.
Tmax
Tmin
Tmean
Click for larger:
sunshine hours 
I’ve been taking Canadian locations with long term continuous data (there are not as many as one might believe) and graphing when the record high temperatures were and the number of days reaching 32C degrees or more. Some of the results can be seen at this Facebook page.
https://www.facebook.com/realclimatedata?ref=aymt_homepage_panel
More is coming this week. In general, by those measures, the period 1910 through the late 40s was much warmer than is commonly believed and the present cooler.
I like what you have done with the data although it will be criticized for the number of stations changing considerably over time and thus not consistently measuring exactly the same thing. Nonetheless, despite that imperfection (and what one analytic illustration is perfect?) it provides further evidence against the idea that we are spiralling toward every increasing heat.
I see only a banner, asking me to log on or sign up. Not everybody uses Facebook …