I'm saying at the very least its very sloppy work and probably heavily influenced by their "conformation bias" that earth is warming.They compared the stations to those nearby, do you really think that temperatures changes follow borders exactly?
Do you think what they did was dishonest?
Of course temperatures dont follow borders exactly, but they can (and do) fluctuate quite a bit even in very close together geographical areas. Take into account Paraguay is not that small of a country (its a bit smaller than California).
I'm just using this graph as a rough example, but look how temperatures can vary in a small area in Texas. I see anywhere from 107 F to 112 F, thats a full 5 degree difference.
Are you gonna tell me their all these thermometers need to be recalibrated as well??