"Approximately 96% of U.S. temperature stations fail to meet what the National Oceanic and Atmospheric Administration considers to be 'acceptable,' uncorrupted placement," says former broadcast meteorologist Anthony Watts in a Heartland Institute study.
Previously, Watts found that "Many climate monitoring stations were located next to exhaust fans of air conditioning units, surrounded by asphalt parking lots and roads, located on blistering-hot rooftops, or placed near sidewalks and buildings that absorb and radiate heat."
"Many stations often had missing, incomplete, or erroneous data, perhaps due to the volunteer-based network of observers who could not always record or report data based upon illness, week-day only reporting, and/or vacation days."
"Major gaps in the data record were 'infilled' with temperature data from nearby sites, compounding errors from other stations that were also non-compliant with station siting requirements."
"Changes in the technology of temperature stations over time resulted in many being placed closer to buildings, as well as other heat sinks such as asphalt, concrete, and brick infrastructure. In some cases, official NWS thermometers were moved to parking lots and next to external heat-generating air conditioner units from previously cooler locations that were no longer available for thermometer placement."
"Nine of every 10 USHCN stations were likely reporting inaccurately high temperatures because they were poorly sited and in violation of NOAA/NWS published standards for thermometer placement."
If we don't know what past temperatures were, how can we know if we are now warming or cooling over the long term? We do know that there has been some warming since the late 1970s, when satellites, the only reliable measure we have, began to record temperatures.
https://issuesinsights.com/2022/08/03/climate-emergency-what-a-crock-part-2/
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