Today, these studies are done with high- resolution(≤2km) satellites that measure surface temperature globally. The comparison is usually the average of all measured surface temperatures across the globe. So they"re referring to the average surface temperature of the Earth, not your backyard. Locally, the lower 48 had the 42nd warmest year on record for average surface temperature, and there is also variation by region within that area.
Now obviously, we have not had expensive satellites with capable instrumentation since the official record began. So as you go back to 1880 surface temperature was measured at observation stations by hand. Which was biased because in 1880 those observations were made in areas that were easily accessible by foot/car/ship, and also at lower resolution globally than today"s satellite data. There is uncertainty there that must be accounted for.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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