I’m looking at what has caused the spike in temperatures in Canada the last five years.
There are only 85 stations in Canada which were active in both 1950 and 2017, and many of these have intermittent data during that time.
I found another flaky station, which since 2014 is reporting many fewer days, and seems to be losing all of the low temperatures.
It doesn’t take very many stations like this to create a large fake upwards trend.