It's not usually as cold in Britain as it is in Russia or Canada. In some parts of Britain winter goes by without any snow falling at all.
It doesn't usually get very cold in the winter or very hot in the summer.
It's not true that Britain is a wet and foggy country. It may not rain very much but you can never be sure of a dry day. Sometimes it rains so heavily that the British say "It's raining cats and dogs."
That's why British people say "Other countries have a climate, in England we have weather. The weather in England changes very quickly. Sometimes the British have weather from each season all in one day.
I People often say that the British talk about the weather all the time. This is an exaggeration, but it's certainly true that the weather is a good way to start a conversation with a stranger. Because of the changeable weather there is always something to talk about in Britain even with a person you don't know.