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"Fahrenheit was an instrument maker. He only had limited materials in his lab. 0 was the temperature of a salt, ice water mixture (easy to produce by all) and 100 was body temperature. Thus he invented a metric scale based on human experiences. Except at extremes, the temperatures most experienced by humans are between 0 and 100. This was a logical scale for egocentric peoples of that age. When the scientist got hold of the instrument, they re-calibrated for freezing and boiling of water and thus set (and slightly changed) the original scale to 32 and 212. Thus 98.6 body temp and 180 divisions between boiling and freezing. The scale is still a great human scale. 50 means 1/2 way to body temp therefore cool, 75 is 3/4 so warm, 100 is body temp so hot, So unlike the Celsius scale when someone says 30, I know to bundle up, not wear shorts. Celsius shrinks all normal human temps to about 40 degrees. Therefore necessitating fractional reporting of temp ie. 25.3 degrees. Great for scientist, bad for human everyday use."

 

...though I am not at all enthusiastic on the use of Fahrenheit like the person who created this answer. About the only time I use a reference to Fahrenheit is when it get over 100F and out comes the old "it's over 100 in the old scale".