Brrrr, do you feel that cold breeze. Maybe I'm imagining it but it seems to feel much colder at high tide.
The Thames is a tidal river, that rises and falls around 7 metres. The incoming tide comes in at nearly twice the speed of the outgoing tide which takes between 6 and 9 hours. A bit of trivia that has nothing to do with me feeling cold, but it might help you win a pub quiz contest.