Article: Mind-Blowing Temperature Fraud At NOAA
Actual measured US climate data shows a longterm downward trend.
NOAA massaged data shows a longterm upward trend. The upward trend is due to taking data from urban (heat island) sites and "filling in missing rural data" that would be cooler than the urban sites.
There are three graphs supporting this accusation.
Unmentioned is fact that the NASA satellite data shows the same downward trend.