Human" climate" change

I have read 98.6 was always a semi fictional number derived from less than stellar observations in the 1800s taken in Germany where the average was rounded to an even 37 degrees C or 98.6 F. The added decimal point belies the accuracy of the observations.  It is a common problem. My newly minted engineers who should know better dutifully record 4 significant digits from 2 significant digit observations.  Some how they feel better about "not rounding" a calculated number.  This is a disease we, the dying class of slide rule users, never suffered from.