Melo, Uruguay is a relatively rural location 300 miles from Buenos Aires. The thermometer data there shows no warming, but NOAA creates 3.8F/century warming by homogenizing in UHI contaminated data from Buenos Aires.
Same data tampering story at Mercedes, 100 miles from Buenos Aires.
Same story for all of Uruguay.
The historical data east of the Andes mountains is dominated by UHI effects from Buenos Aires.
Data.GISS: GISS Surface Temperature Analysis (v4): Station Data
UHI at Buenos Aires corrupts much the temperature data in South America. NOAA claims that they partially mitigate the problem through homogenization, but they don’t.
Data.GISS: GISS Surface Temperature Analysis (v4)
I wonder how much of their staff time is taken up with seeking out and perverting good data.