 The record low temperature in Duluth is , set on January 2, 1885, and the record high temperature is , set on July 13, 1936.On average, the first freezing temperature occurs on September 25, and the last on May 25, though a freezing temperature has occurred in August; the average window for measurable (≥) snowfall is October 21 through April 23.From June 19–20, 2012, Duluth suffered the worst flood in its history, caused by of rain throughout the course of thirty hours.