Prior to 60 years ago, September was frequently a hot month in the US. But temperatures have plummeted.
On this date in 1947, it was 114 degrees in Kansas and there was a massive heatwave across much of the US.
03 Sep 1947, 1 – The Manhattan Mercury at Newspapers.com
The heatwave last for two weeks, until September 10.
On this date in 1925, most of the eastern US was over 100 degrees.
It was the hottest September day on record in parts of Canada.
03 Sep 1925, 1 – Star-Phoenix at Newspapers.com
The coolest September 3 was in 1974, but I didn’t know about it because it was over 100 degrees in Tempe.