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Illinois GHCN airports show warming, while the non-airport stations show cooling.
When I see stuff like this, it sends up a huge red warning flag, which reads “complete garbage.” Both sets of temperatures were taken covering the same state over the same time period. The divergence in polarity tells us that something is fatally contaminating the data. The graph below indicates that the S/N ratio is probably an unbelievably poor < 0.25.
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