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The RSS satellite temperature series for the lower troposphere can be found here:
One of columns is for the continental US. The linear trend from 1979 through 2012 is 0.20°C/decade.

The National Climate Data Center (NCDC, part of NOAA) provides temperature data for the US going back to 1895:
Their ground-based temperature trend from 1979 through 2012 is 0.54°F/decade, which converts to 0.30°C/decade.

So, Houston, we have a problem. The land-based trend is 50% greater than the satellite based trend. GCMs indicate over land the lower atmosphere should warm at a factor of 0.95x the land. For a discussion of this amplification factor by Gavin Schmidt, see here:

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