I find this really cool, kudos to the author for trying to build up an understanding from the actual data.

I find it interesting to see that the median temps in these select cities don't seem to be wandering up that much. I wonder if there is some statistical tool to analyze the slight upward angle on the linear regressions of the medians.

I am surprised that these data do not show a more extreme departure. I believe that we are getting hotter temperatures, etc etc. But perhaps my observations are colored by the media on this - if I were a lizard, would I see climate change?