Help from readers

I have a question that bothers me every year at Christmas time. I have looked it up before and the answers I can find do not satisfy me.

Why is "My Favorite Things" played as a Christmas song? In the movie, it is during a summer thunderstorm to help calm the children. There is one line about packages tied up with strings. How does this qualify as Christmas?

The one explanation I have found is that the sounds conjure up winter images. I don't buy it! Anyone have any other ideas why they play it at Christmas?