Until 60 years ago, this time of year used to often be hot around the US, but hot weather this late in the year has become rare in most locations.
These maps show the five hottest September 9ths, in 1931, 1925, 1939, 1955 and 1912.
Until 60 years ago, this time of year used to often be hot around the US, but hot weather this late in the year has become rare in most locations.
These maps show the five hottest September 9ths, in 1931, 1925, 1939, 1955 and 1912.