[hnuser123456]

No, but it would be cool in the nerdy sense to have a dataset of average temperatures in various conditions, or at least e.g. people are within 98-99f about 60% of the time, within 97.5-99.5 about 90% of the time, within 97-101 about 97% of the time etc, as measured by X device/method at Y time of day after "average" activity level etc.

Instead of just giving temperature, a thermometer could say "there is a 70% chance that your immune system is more active than usual" etc

Of course, small additional data points like "i'm exhausted and coughing more than usual" increase the confidence of the result by orders of magnitude over just temperature...