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.