Philadelphia and the rest of the Washington-Boston megapolis is situated in a rich precipitation corridor where rainfall has a reliability record that Amtrak and Septa might envy.
In fact, the Northeast is located in the world's most reliable precipitation zone, according to meteorologist Richard A. Keen, author of Skywatch East, an excellent weather primer, by the way.
Just how reliable? We took a look at the Philadelphia record.
Through July, precipitation had been monitored officially in Philadelphia on 50,608 days since record-keeping began in 1872.