There's been a tremendous amount of rain this summer in London, and the same in most places in Britain I think. It's also been warm, and a lot of thunder and lightning. The rain has been very heavy on occasion though and I've got soaked through a few times outside.
Peter Brown's painting (right) was on display at the recent New English Art Club exhibition (just finished). It's called Saint Martin's Lane, Rain (oil, 48x25cm) and he gets the wet, grey atmosphere just right.