Having spent meaningful time in Reykjavik… hard concur. Seeing Dublin and Chicago in their target range simply reinforces the doubt. The bad assumptions start with average temp, but this is where it goes off the rails:

> Let’s see the same plot, including only the cities within one degree of Toronto’s average temperature.

So theyre really looking at “cities with an average temp similar to toronto, but lower variability.” That is certainly one wag to look at weather, but Id be hard pressed to accept its “nice.”