The concept of a thousand-year rainstorm is legitimate but limited. Here’s what you should understand about it

Quoted: A 1,000-year rain event, as its name implies, is exceptionally rare. It signifies just a 0.1 percent chance of such an event happening in any given year. “Or, a better way to think about it is that 99.9 percent of the time, such an event will never happen,” explained Shane Hubbard, a meteorological researcher at University of Wisconsin’s Space Science and Engineering Center.