Why does the US still use Fahrenheit?

Answer 1

The USA is very resistant to metrication.

The Fahrenheit scale was the primary temperature standard for climatic, industrial and medical purposes in most English-speaking countries until the 1960s. In the late 1960's and 1970's, the Celsius (formerly centigrade) scale was adopted by most of these countries as part of the standardizing process called metrication. Only in the United States and a few other countries does the Fahrenheit system continue to be used, and only for non-scientific use. Most other countries have adopted Celsius as the primary scale in all use, although Fahrenheit continues to be the scale of preference for a minority of people in the UK, particularly when referring to summer temperatures. Most Britons are conversant with both Celsius and Fahrenheit. Resistance to the Celsius system was partly due to the larger size of each degree Celsius, resulting in the need for fractions, where integral Fahrenheit degrees were adequate for much technical work. The lower zero point in the Fahrenheit system reduced the number of negative signs when measurements such as weather data were averaged
the US is used to this system (not keen on change) also they do not use the Metric system either like they do in most countries, they also do not have a Universal health care system, eventually all this will change with different generations one would think.