Normal is change
Normal is now; not the way it was in 1963 and not the way it will be twenty years from now. Normal sits within a set of parameters that are arbitrarily prescribed by ourselves per se, to fit today.
The weather, particularly the winters when I was growing up we're more severe than those we've experienced in the last 15 to 20 years. So what is normal? Between you and me normal can be the same, an arm's length, or a Continent apart. When the weatherman says the day was unseasonably warm or cold or dry or rainy or whatever, he's referring to what is expected based on the recent past.
Normal is what lets us make sense of the world and gives us comfort in our day to day routine. When the normal begins to vary, we become uneasy with the effort required to adapt to the New Norm.
The only thing normal is change and adapting to those changes is what manifests itself as survival.