The measured US temperature data from USHCN shows that the US is on a long-term cooling trend. But the reported temperatures from NOAA show a strong warming trend.

Measured : ushcn.tavg.latest.raw.tar.gz
Reported : ushcn.tavg.latest.FLs.52j.tar.gz

They accomplish this through a spectacular hockey stick of data tampering, which corrupts the US temperature trend by almost two degrees.

The biggest component of this fraud is making up data. Almost half of all reported US temperature data is now fake. They fill in missing rural data with urban data to create the appearance of non-existent US warming.