I believe nature runs a course of moods and tudes as we humans do. I don't think anything peculiar, just simply mother nature being who she is...sometimes mild, sometimes tearful...sometimes defensive, and sometimes down right nasty.
I've seen a wave of weather since a child...and actually, our winters are a little milder on the whole then they used to be....
There are and always will be, waves of hurricanes, noreasters...tornadoes, earthquakes, etc....
Hot and Dry weather, rainy weather, down right cold and frigid weather, and mild, dark, rainy, cloudy...it's natures way...