It's not only Britain that has changeable weather conditions. However the expression, oft used by weather forecasters, "sunshine and showers" seems uniquely British.
On a good day you might expect 10 minutes of rain, followed immediately by rays of bright sunshine breaking through the clouds and lighting up the freshly washed foliage that makes up England's green and pleasant land. And then rain again a few minutes later.
As I sit writing, out of the window I see dark clouds overhead, while the trees beneath them are brightly illuminated by the sunlight hitting them from out of my field of vision.
The weather is, supposedly, a British obsession, something we talk about when we have nothing else to say. Perhaps it is even one of the things (apart from our language) that still holds the English, Scottish and Welsh together. And if talking about the weather is one of our social fillers (in Taiwan it is food - ni che bao le ma?), I'd better get used to the language used to describe it.
And the clothes to endure it.