Bullshit. The World Meteorological Organization the the International Bureau of Weights and Measures have gone to great lengths to assure the accuracy of the instruments used in Cooperative Weather Observer stations. The question is not whether or not they are defective. Defective instruments get replaced. The question is how accurate they are throughout their range. See https://rmets.onlinelibrary.wiley.com/doi/full/10.1002/met.1527
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