Found this interesting...

Just the fact that it has been questioned...

So what makes it so distinctly variable? "Britain's unique weather is all down to the fact it is an island and where it's positioned on the planet, between the Atlantic Ocean and a large land mass, continental Europe," says Helen Chivers from the Met Office. "There is a lot going on meteorologically where we are."8 Oct 2013

This is bullshit and was never the case growing up in Britain.

A forecast is a prediction of what will happen. ... While often used in the context of weather, forecast can also be used for other types of predictions such as those related to financial or political outcomes. Note that a forecast is typically a prediction made by experts.