Afternoon temperatures at Toledo, Iowa have been declining since the 19th century at a rate of 2F per century. They used to get days over 105F fairly often, but it hasn’t happened since 1940. Their hottest day was 109F on July 24, 1901
https://www.ncei.noaa.gov/pub/data/ghcn/daily/all/USC00138296.dly
Toledo is a well sited rural station located in Central Iowa.
In their GHCN database, NOAA alters the temperature trend at Toledo (USC00138296) to change it from cooling into warming
https://www.ncei.noaa.gov/pub/data/ghcn/v4/ghcnm.tavg.latest.qcu.tar.gz
https://www.ncei.noaa.gov/pub/data/ghcn/v4/ghcnm.tavg.latest.qcf.tar.gz
In order to create their imaginary warming trend, NOAA cools past temperatures by as much as 3.7F and warms recent temperatures 1.15F.
I believe Willy Soon and the Connolly’s have a couple of papers detailing what happens when you use only rural sited stations to the US temp record. And they found the same trend as you deliver here. Only a slight cooling since ~1900.
D. Boss, you got it right but there’s more to be told and Tony Heller didn’t mention it either in this post….Toledo Iowa is one of the long-term weather stations in the United States. I know that because I’m a nerd…lol… but also a big fan of the late John Daly from Australia. Mr Daly showed… gosh it’s got to be maybe 20 years ago…. he showed that the long-term weather stations like St. Cloud Minnesota and Toledo Iowa did not show a warming trend over the past 125 years. Tony Heller has often mentioned that long-term weather stations tell a different story than short-term.