Columns in the chart show average temperature trends for four multi-decadal periods within the century depicted.
Update March 16, 2020
Several years ago I analyzed and compared temperature records from the highest quality US weather stations as assessed by surfacestations.org project. A recent discussion at WUWT reminded me that my report had no graphs to illustrate the finding, so the image above is provided in this update.
The previous post is reprinted below with the details. In summary, trends were computed and compiled from absolute temperatures recorded at 23 CRN#1 stations spread around the continental US. The unadjusted records were quite mixed and collectively showed a flat century trend. However, adjusted records from the same stations showed warming of 0.68 over the century.
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