89% of temperature stations over-estimate temperatures: I wonder if that's a problem...

More about an environmental topic I've visited previously: temperature station measurement bias...

An update from James Taylor in Environment & Climate News on research by Anthony Watts...

Eighty-nine percent of official U.S. temperature measurement stations are corrupted by poor site selection that gives false warming signals, according to a new study by meteorologist Anthony Watts.

According to the federal government’s own siting criteria, the corrupting influences at those stations create a margin of error larger than the entire asserted warming of the twentieth century....

A variety of factors are responsible for the flawed data and resultant warming bias, the study reports. Some stations have been corrupted by land-use changes and urban development nearby, resulting in an artificial warming signal over time. Other stations were moved from uncorrupted sites to corrupted ones for the convenience of persons reading the temperatures. Still others are and always have been located in places that are just plain ridiculous, the study shows....Another source of heat bias was added in 1979 when NOAA changed its guidelines on temperature shelters to specify white latex paint instead of whitewash....