London is known for its rainy weather, with an annual rainfall of 650 millimeters. While it rains often in London, it is less rainy than some other cities. The document argues that what makes London's rain romantic is the ubiquitous black umbrella used by Londoners to protect themselves from the rain. The black umbrella is a constant companion for Londoners and serves purposes beyond just protection from rain, including as a tool for intimacy, dance, and self-expression, as captured in some artistic depictions of Londoners and their black umbrellas.