Well. I'll tell ya. For some Europeans, including Italians, November 11th, which is upcoming, is also supposed to be in the midst of a period of time characterized by mild, beautiful weather. A sort of reprieve from the awful meteorolological events just around the corner.
In the Unites States we call this "Indian summer." Some furriners (for example, the English) have adopted this term despite the absence of Indians (American Indians, not Indians from India) on their territory.
So why Saint Martin? November 11th is the name day of Martin (in Italian, onomastico).
Whatever you call it, here or in Europe, I am thoroughly enjoying this wonderful respite from the usual New England weather.