Fully Fabricated Warming Trend In Chandler, Arizona | Real Science

Through the magic of adjustments, USHCN has created a strong warming trend (red) in Chandler, Arizona – where the thermometer data (blue) shows none.

They did this by subtracting four degrees from temperatures prior to 1910, and two degrees for temperatures prior to 1989. As you can see above, this creates a nice consistent warming trend.