the false concept that the local weather is unique to all other weather in the world and is in itself its own entity. It is usually mundanely referenced when the weather is out of synch for the season. i.e. A 60F degree January day in Cleveland.
Fat old lady from Cleveland getting into her mini-van, "This ain't no winter day, it feels like summer! Kooky Cleveland weather!"
Intelligent bystander, "What's that? Are you another idiot with a regional weather complex?"