And indeed, such a quantity does exist, and can be found on the climate.weatheroffice.gc.ca website. There is also a physical background for that quantity. Hence, the windchill is defined as
where points on top are temperature, while below we have felt temperature.So, basically, winters are even colder than what you might think..
And the story is not over, yet. The same thing holds for summer: if you take into account humidity, summer are even hotter than what you think... There is the humidex, , defined here as
That index appeared in the 70's, with a work of Masterson and Richardson entitled a method of quantifying human discomfort due to excessive heat and humidity (published in 1979).By that time, in Canada, on average, 22 people died, per year, because of those excessive heat and humidity. For those interested by the origin of that index, you can have a look here.
Recently, @Annmaria (here) told me that one might expect variance to increase, i.e. maximas should be increasing faster than minimas. I just wonder if this intuition can be related to the fact that more and more people (including some medias) now talk more about felt temperatures than measured temperatures. And if we compare past temperatures to felt temperature we have today, it looks like the difference between extremes is increasing....