June 20 – On this day in Montana history in 1921 the record for rainfall in a 24-hour period was set at 11.5 inches. It was recorded in Circle, and if you have been to Circle you know the odds against the record being set there are high. In fact, the average rainfall for the entire year in Circle is 13.3 inches. The resulting floods on the Redwater swept away homes and killed at least one person.