Temperature readings are done with an accuracy of +/- 20 degrees. This is because temperatures simultaneously at various points of the tread, sidewall, internally, close the hub, or further away vary to a high extent. Within the TPMS sensors we have a very fine temperature sensor that feeds the data to our sensor algorithm. What the reporting tell you is the exact point in time at which the temperature increment changes. When the report goes from 0C to 20C you know that at that exact moment, the temperature was around 10C. With a graph of those points you can mathematically interpolating the temperature at each point in time on a smoothed graph. Also, when the monitor reports a high temp alert, then you know that you have just crossed into the rubber danger zone.
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