1. The climate and the nature of GB are very specifi, because it's situated on islands and s surrounded by sea from all the sides.
2.It's famous for its fogs.
3.Britain's climate got such a bad reputation because the weather there changes very often and is unpredictable.
4.Yes, it is. You can experience all types of weather during one day.
5.Yes, it is, but usually very little rain falls at a time.(За один раз дождь льёт очень мало, моросит)