Comprehensive study by Anthony Watts reveals stunning problems. Eight hundred and fifty-four (854) of the 1221 official climate monitoring stations across the country were surveyed and nearly 90% are not properly sited.
Some are located next to buildings and heat-generating electrical equipment. This alone taints the climate record and leads to erroneous warming. Other changes have imparted irregular warming, such as changing the coating on the Stevenson screens, the shelters used to house thermometers, from a whitewash to latex paint in 1979.
An experiment by Watts proves the latex-painted shelters are slightly warmer than the whitewashed shelters. And then you have to account for the change in the actual thermometers, from those requiring manual readings to the new electronic version that's been gradually phased in since the mid 1980s.
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